What is the mood index?

I find that I'm often in the mood for something, more than looking for something in a specific genre. So the Mood Index is an attempt to help you find the reviews linking to books that'd fit your reading mood.
It is, obviously, a very subjective classification, but one, I hope, that might be useful.

Something big and/OR epic

AHMED Saladin, Throne of the Crescent Moon.
AOKI Ryka, Light from Uncommon Stars.
AYLIFF John, Belt Three.
BANKS Iain, Excession.
BANKS Iain, Feersum Endjinn.
CHNG Joyce, Starfang.
COREY James S.A., The Expanse.
DAS Indra, The Devourers.
DAVIES OKUNGBOWA Suyi, David Mogo, Godhunter.
DRAYDEN Nicky, The Prey of Gods.
GLADSTONE Max, The Craft Sequence.
HOBB Robin, Fitz and The Fool.
HOBB Robin, The Liveship Traders.
HOFFMANN Ada, The Outside.
HOSSAIN Saad Z., Djinn City.
JEMISIN N. K., The Fifth Season.
KEYES Greg, The Kingdoms of Thorn and Bone.
KUANG R.F., The Poppy War.
LECKIE Ann, Ancillary Justice.
McKENNA Juliet, The Tales of Einarinn.
McMASTER BUJOLD Lois, The Vorkosigan Saga.
MARTINE Arkady, A Memory Called Empire.
MORDEN Simon, The Books of Down.
MORENO-GARCIA Silvia, Gods of Jade and Shadow.
NEWMAN Emma, The Split Worlds.
OKORAFOR Nnedi, The Book of Phoenix.
RUSCH Kristine Kathryn, The Fey.
STROSS Charlie, The Laundry.
STROSS Charlie, The Merchant Princes / Empire Games.
SURI Tasha, Empire of Sand.
TCHAIKOVSKY Adrian, Children of Time.
TCHAIKOVSKY Adrian, Shards of Earth.
THOMPSON Tade, Rosewater and The Rosewater Insurrection.
WALTON Jo, The Just City.
WILLIAMS Jen, The Winnowing Flame.
WILLIAMS Jen, The Copper Cat.

SOMETHING SHORT

ACKS Alex, Murder on the Titania, and Other Steam-Powered Adventures.
BELL Derrick, "The Space Traders".
CHIANG Ted, "Story of your life".
DILA Dilman, The Future god of Love.
DUBOIS W. E. B.,"The Comet".
EL MOHTAR Amal, "And their lips rang with the Sun".
GANGULY Gigi, One Arm Shorter Than the Other.
GIDNEY Craig Laurance, A Spectral Hue.
GRACE Dan, Winter.
HELGADOTTIR Margrét (editor), Winter Tales.
HOTSTON Stewart, The Entropy of Loss.
JIMENEZ Tiffany, The Moment You Remember You Forget.
JONES Stephen Graham, Mapping the Interior (external link to Black Girl Nerds).
JY Yang, The Tensorate Series.
KAGUNDA Shingai Njeri, & This Is How To Stay Alive.
KEMP Juliet, A Glimmer of Silver.
KHAW Cassandra, Food of the Gods.
KLAGES Ellen, Passing Strange.
KNIGHT Zelda and Ekpeki OGHENECHOVWE Donald (editors), Dominion (Anthology).
LAVALLE Victor, The Ballad of Black Tom.
LIU Ken, The Paper Menagerie.
McKENNA Juliet, Shadow Histories of the River Kingdom.
MAKERETI Tina, Once Upon a Time in Aotearoa.
MALIK Usman, The Pauper Prince and the Eucalyptus Jinn.
MIÉVILLE China, This Census-Taker.
MOHAMED Premee, These Lifeless Things.
MORDEN Simon, Bright Morning Star.
MORROW Bethany, MEM.
MOSLEY Walter, Disciple.
OKORAFOR Nnedi, Binti (external link to Black Girl Nerds).
SHARMA Priya, Ormeshadow.
SINGH Vandana, "Delhi".
TALABI Wole, Incomplete Solutions.
TCHAIKOVSKY Adrian, The Expert System's Brother.
TCHAIKOVSKY Adrian, Ironclads.
TCHAIKOVSKY Adrian, Walking to Aldebaran.
THOMAS Sheree Renée, Nine Bar Blues.
TIDHAR Lavie, Unholy Land.
WATTS Peter, The Freeze-Frame Revolution.
WELLS MArtha, All Systems Red.
WHITELEY Aliya, The Arrival of Missives.
WHITELEY Aliya, The Loosening Skin.

SOMETHING THAT'LL TAKE ME TO SPACE

AYLIFF John, Belt Three.
BANKS Iain, Excession.
BROOKMYRE Chris, Places in the Darkness.
BURKE Sue, Semiosis.
CHNG Joyce, Starfang.
COREY James S.A., The Expanse.
DE BODARD Aliette, On a Red Station Drifting / The Citadel of Weeping Pearls.
DELANY Samuel, The Ballad of Beta-2.
HOFFMANN Ada, The Outside.
JIMENEZ Simon, The Vanished Birds.
LAFFERTY Mur, Six Wakes.
McMASTER BUJOLD Lois, The Vorkosigan Saga.
MORDEN Simon, One Way & No Way.
MORENO-GARCIA Silvia, Prime Meridian.
OH Temi, Do You Dream of Terra-Two?
OKORAFOR Nnedi, Binti (external link to Black Girl Nerds).
SOLOMON Rivers, An Unkindness of ghosts (external link to Black Girl Nerds).
TCHAIKOVSKY Adrian, Children of Time.
TCHAIKOVSKY Adrian, Shards of Earth.
TCHAIKOVSKY Adrian, Walking to Aldebaran.
WAGNER Wendy, An Oath of Dogs.
WARD Jonathan, Caleuche.
WATTS Peter, The Freeze-Frame Revolution.

SOMETHING THAT'LL TAKE ME TO ANOTHER WORLD

AARONOVITCH Ben, Rivers of London.
ACKS Alex, Murder on the Titania, and Other Steam-Powered Adventures.
AHMED Saladin, Throne of the Crescent Moon.
BECKETT Chris, Dark Eden.
BRISSETT Jennifer Marie, Destroyer of Light.
BURKE Sue, Semiosis.
CARRIGER Gail, The Parasol Protectorate.
COGMAN Genevieve, The Invisible Library.
HOBB Robin, Fitz and The Fool.
HOPKINSON Nalo, Midnight Robber.
HOSSAIN Saad Z., Djinn City.
JEMISIN N. K., The Fifth Season.
JOYCE Graham, The Silent Land.
JY Yang, The Tensorate Series.
KEMP Juliet, A Glimmer of Silver.
KEYES Greg, The Kingdoms of Thorn and Bone.
KUANG R.F., The Poppy War.
LE GUIN Ursula, The Dispossessed.
LANGMEAD Oliver, Metronome.
LEMBERG R. B., The Four Profound Weaves.
LORD Karen, The Best of All Possible Worlds.
McKENNA Juliet, The Tales of Einarinn.
McKENNA Juliet, Shadow Histories of the River Kingdom.
MIÉVILLE China, This Census-Taker.
MORDEN Simon, The Books of Down.
NEWMAN Emma, The Split Worlds.
NG Jeannette, Under the Pendulum Sun.
PEARS Ian, Arcadia.
PRATCHETT Terry, Maskerade.
PRATCHETT Terry, Night Watch.
RUSCH Kristine Kathryn, The Fey.
STROSS Charlie, The Merchant Princes / Empire Games.
SURI Tasha, Empire of Sand.
TEPPER Sheri, Grass.
TIDHAR Lavie, Unholy Land.
WILLIAMS Jen, The Copper Cat.
WILLIAMS Jen, The Winnowing Flame.

SOMETHING COSY

BAJABER Khadija Abdalla, The House of Rust.
CARRIGER Gail, The Parasol Protectorate.
COGMAN Genevieve, The Invisible Library.
DILA Dilman, The Future god of Love.
JIMENEZ Tiffany, The Moment You Remember You Forget.
KEMP Juliet, A Glimmer of Silver.
McKENNA Juliet, The Green Man's Heir , The Green Man's Foe and The Green Man's Challenge .
MORENO-GARCIA Silvia, The Beautiful Ones.
WELLS MArtha, All Systems Red.
WILLIS Connie, Crosstalk.
WILLIS Connie, To Say Nothing of the Dog.

SOMETHING WITH ALL THE SCARES or the gore (OR JUST A LITTLE BIT)

CAREY M. R., The Girl with all the Gifts.
DAS Indra, The Devourers.
JONES Stephen Graham, Mapping the Interior (external link to Black Girl Nerds).
JONES Stephen Graham, The Only Good Indians.
KHAW Cassandra, Food of the Gods.
KHAW Cassandra, Hammers on Bone (external link to Black Girl Nerds).
LAVALLE Victor, The Ballad of Black Tom.
MOHAMED Premee, These Lifeless Things.
OYEYEMI Helen, White is for Witching.
SHARMA Priya, Ormeshadow.
THOMPSON Tade, The Murders of Molly Southbourne.

SOMETHING THAT'LL SPEAK UNFLINCHINGLY ABOUT OUR WORLD'S ISSUES

AKBAR Prayaag, Leila.
ALDERMAN Naomi, The Power.
AOKI Ryka, Light from Uncommon Stars.
AZEM Ibtisam, The Book of Disappearance.
BARRETT A. Igoni, Blackass.
BUTLER Octavia, Kindred.
BUTLER Octavia, Parable of the Sower.
COLEMAN Claire G., Terra Nullius.
DIFRANCESCO Alex, All City.
HOPKINSON Nalo, Midnight Robber.
HOTSTON Stewart, Tangle's Game.
JEMISIN N. K., The Fifth Season.
KHALED TOWFIK Ahmed, Utopia.
KUNZRU Hari, White Tears.
LE GUIN Ursula, The Dispossessed.
LAVALLE Victor, The Ballad of Black Tom.
MORDEN Simon, Bright Morning Star.
PRATCHETT Terry, Night Watch.
ROGERS Jane, The Testament of Jessie Lamb.
SAADAWI Ahmed, Frankenstein in Baghdad.
SOLOMON Rivers, An Unkindness of ghosts (external link to Black Girl Nerds).
TIDHAR Lavie, Unholy Land.
WILSON Lorraine, This is our Undoing.
WOOD Nick, Azanian Bridges.

something with a big concept

ALDERMAN Naomi, The Power.
ALLAN Nina, The Rift.
AOKI Ryka, Light from Uncommon Stars.
AZEM Ibtisam, The Book of Disappearance.
BARNES Adrian, Nod.
BECKETT Chris, Dark Eden.
BRISSETT Jennifer Marie, Elysium.
COLEMAN Claire G., Terra Nullius.
DAS Indra, The Devourers.
HARKAWAY Nick, Gnomon.
HUCHU T. L., The Library of the Dead.
LIU Cixin, The Three Body Problem.
MASCARENHAS Kate, The Psychology of Time Travel.
MORRIS Jan, Hav.
MORROW Bethany, MEM.
NEWMAN Emma, Planetfall, After Atlas.
NG Jeannette, Under the Pendulum Sun.
ROGERS Jane, The Testament of Jessie Lamb.
SILVEY Catriona, Meet Me in Another Life.
TCHAIKOVSKY Adrian, Children of Time.
TCHAIKOVSKY Adrian, The Expert System's Brother.
TCHAIKOVSKY Adrian, Ironclads.
TCHAIKOVSKY Adrian, Walking to Aldebaran.
TEPPER Sheri, Grass.
THOMPSON Tade, The Murders of Molly Southbourne.
THOMPSON Tade, Rosewater and The Rosewater Insurrection.
WALTON Jo, The Just City.
WHITELEY Aliya, The Loosening Skin.

SOMETHING WITH EXQUISITE WRITING

ALLAN Nina, The Rift.
AOKI Ryka, Light from Uncommon Stars.
AZEM Ibtisam, The Book of Disappearance.
BACON Eugen, Claiming T-Mo.
BAJABER Khadija Abdalla, The House of Rust.
BRISSETT Jennifer Marie, Destroyer of Light.
BRISSETT Jennifer Marie, Elysium.
COLEMAN Claire G., Terra Nullius.
HOPKINSON Nalo, Midnight Robber.
JIMENEZ Simon, The Vanished Birds.
JOYCE Graham, The Silent Land.
KAGUNDA Shingai Njeri, & This Is How To Stay Alive.
LEMBERG R. B., The Four Profound Weaves.
MALIK Usman, The Pauper Prince and the Eucalyptus Jinn.
MORRIS Jan, Hav.
NG Jeannette, Under the Pendulum Sun.
ST JOHN MANDEL Emily, Station Eleven.
THOMAS Sheree Renée, Nine Bar Blues.
WRIGHT Alexis, The Swan Book.

SOMETHING WITH A MYSTERY

AARONOVITCH Ben, Rivers of London.
ACKS Alex, Murder on the Titania, and Other Steam-Powered Adventures.
ALLAN Nina, The Rift.
BROOKMYRE Chris, Places in the Darkness.
HOLLAND-KEEN Vincent, The Office of Lost and Found.
HOTSTON Stewart, Tangle's Game.
HUCHU T. L., The Library of the Dead.
JOYCE Graham, The Silent Land.
LAFFERTY Mur, Six Wakes.
McKENNA Juliet, The Green Man's Heir , The Green Man's Foe and The Green Man's Challenge .
MARTINE Arkady, A Memory Called Empire.
MASCARENHAS Kate, The Psychology of Time Travel.
O'MALLEY Daniel, The Rook.
SILVEY Catriona, Meet Me in Another Life.
SUDDAIN M., Hunters & Collectors.
WAGNER Wendy, An Oath of Dogs.
WILLIS Connie, To Say Nothing of the Dog.
WILSON Lorraine, This is our Undoing.

SOMETHING SCIENCY

BURKE Sue, Semiosis.
HOTSTON Stewart, The Entropy of Loss.
LIU Cixin, The Three Body Problem.
MORDEN Simon, One Way & No Way.
TCHAIKOVSKY Adrian, Children of Time.
TCHAIKOVSKY Adrian, The Expert System's Brother.

SOMETHING WITH (A LITTLE) MELANCHOLY

ALLAN Nina, The Rift.
DE BODARD Aliette, On a Red Station Drifting / The Citadel of Weeping Pearls.
DE BODARD Aliette, Lullaby for a lost world.
GANGULY Gigi, One Arm Shorter Than the Other.
GIDNEY Craig Laurance, A Spectral Hue.
HOTSTON Stewart, The Entropy of Loss.
JIMENEZ Simon, The Vanished Birds.
JIMENEZ Tiffany, The Moment You Remember You Forget.
JOYCE Graham, The Silent Land.
KAGUNDA Shingai Njeri, & This Is How To Stay Alive.
KLAGES Ellen, Passing Strange.
LANGMEAD Oliver, Metronome.
LEMBERG R. B., The Four Profound Weaves.
MAKERETI Tina, Once Upon a Time in Aotearoa.
MALIK Usman, The Pauper Prince and the Eucalyptus Jinn.
MIÉVILLE China, This Census-Taker.
MORRIS Jan, Hav.
SHARMA Priya, Ormeshadow.
SILVEY Catriona, Meet Me in Another Life.
ST JOHN MANDEL Emily, Station Eleven.
WRIGHT Alexis, The Swan Book.

SOMETHING COMPLEX AND LAYERED

ALLAN Nina, The Rift.
BACON Eugen, Claiming T-Mo.
BANKS Iain, Feersum Endjinn.
BRISSETT Jennifer Marie, Destroyer of Light.
COLEMAN Claire G., Terra Nullius.
HARKAWAY Nick, Gnomon.
HOLLOWAY Verity, Pseudotooth.
HOPKINSON Nalo, Midnight Robber.
JEMISIN N. K., The Fifth Season.
LE GUIN Ursula, The Dispossessed.
MARTINE Arkady, A Memory Called Empire.
NG Jeannette, Under the Pendulum Sun.
ST JOHN MANDEL Emily, Station Eleven.
THOMPSON Tade, Rosewater and The Rosewater Insurrection.
WRIGHT Alexis, The Swan Book.

something that reads fast and easy (REGARDLESS OF PACE AND LENGTH)

ACKS Alex, Murder on the Titania, and Other Steam-Powered Adventures.
AHMED Saladin, Throne of the Crescent Moon.
BARRETT A. Igoni, Blackass.
BROOKMYRE Chris, Places in the Darkness.
CAREY M. R., The Girl with all the Gifts.
CARRIGER Gail, The Parasol Protectorate.
CHNG Joyce, Starfang.
COGMAN Genevieve, The Invisible Library.
COREY James S.A., The Expanse.
DELANY Samuel, The Ballad of Beta-2.
DILA Dilman, The Future god of Love.
DRAYDEN Nicky, The Prey of Gods.
GANGULY Gigi, One Arm Shorter Than the Other.
GLADSTONE Max, The Craft Sequence.
HOTSTON Stewart, Tangle's Game.
HUCHU T. L., The Library of the Dead.
JONES Stephen Graham, The Only Good Indians.
JOYCE Graham, The Silent Land.
JY Yang, The Tensorate Series.
KEMP Juliet, A Glimmer of Silver.
KEYES Greg, The Kingdoms of Thorn and Bone.
KHAW Cassandra, Food of the Gods.
KLAGES Ellen, Passing Strange.
LAFFERTY Mur, Six Wakes.
LANGMEAD Oliver, Metronome.
LEMBERG R. B., The Four Profound Weaves.
McKENNA Juliet, The Green Man's Heir , The Green Man's Foe and The Green Man's Challenge .
McKENNA Juliet, Shadow Histories of the River Kingdom.
McMASTER BUJOLD Lois, The Vorkosigan Saga.
MORDEN Simon, The Books of Down.
MORDEN Simon, One Way & No Way.
MORENO-GARCIA Silvia, The Beautiful Ones.
MORENO-GARCIA Silvia, Prime Meridian.
MORENO-GARCIA Silvia, Gods of Jade and Shadow.
NEWMAN Emma, The Split Worlds.
O'MALLEY Daniel, The Rook.
SILVEY Catriona, Meet Me in Another Life.
STROSS Charlie, The Laundry.
STROSS Charlie, The Merchant Princes / Empire Games.
SURI Tasha, Empire of Sand.
TCHAIKOVSKY Adrian, The Expert System's Brother.
TCHAIKOVSKY Adrian, Shards of Earth.
WAGNER Wendy, An Oath of Dogs.
WALTON Jo, The Just City.
WARD Jonathan, Caleuche.
WILLIAMS Jen, The Copper Cat.
WILLIAMS Jen, The Winnowing Flame.
WILLIS Connie, Crosstalk.
WILLIS Connie, To Say Nothing of the Dog.

SOMETHING THAT'S GOING TO TRY TO RIP MY HEART OUT

AOKI Ryka, Light from Uncommon Stars.
BRISSETT Jennifer Marie, Destroyer of Light.
BUTLER Octavia, Kindred.
HOBB Robin, Fitz and The Fool.
JEMISIN N. K., The Fifth Season.
JIMENEZ Simon, The Vanished Birds.
JOYCE Graham, The Silent Land.
KLAGES Ellen, Passing Strange.
LEMBERG R. B., The Four Profound Weaves.
MORENO-GARCIA Silvia, The Beautiful Ones.
MORENO-GARCIA Silvia, Prime Meridian.
MORENO-GARCIA Silvia, Gods of Jade and Shadow.
NEWMAN Emma, Planetfall, After Atlas.
NEWMAN Emma, The Split Worlds.
SHARMA Priya, Ormeshadow.
SILVEY Catriona, Meet Me in Another Life.
ST JOHN MANDEL Emily, Station Eleven.
SURI Tasha, Empire of Sand.
WALTON Jo, The Just City.

SOMETHING INTENSE

AKBAR Prayaag, Leila.
ALDERMAN Naomi, The Power.
AZEM Ibtisam, The Book of Disappearance.
BACON Eugen, Claiming T-Mo.
BARNES Adrian, Nod.
BECKETT Chris, Dark Eden.
BRISSETT Jennifer Marie, Destroyer of Light.
BRISSETT Jennifer Marie, Elysium.
BUTLER Octavia, Kindred.
BUTLER Octavia, Parable of the Sower.
CAREY M. R., The Girl with all the Gifts.
CHIANG Ted, "Story of your life".
COLEMAN Claire G., Terra Nullius.
CORNELL Paul, Chalk.
DAS Indra, The Devourers.
DIFRANCESCO Alex, All City.
GRACE Dan, Winter.
JEMISIN N. K., The Fifth Season.
KHALED TOWFIK Ahmed, Utopia.
KUANG R.F., The Poppy War.
KUNZRU Hari, White Tears.
LAVALLE Victor, The Ballad of Black Tom.
MIÉVILLE China, This Census-Taker.
MOHAMED Premee, These Lifeless Things.
NEWMAN Emma, Planetfall, After Atlas.
NG Jeannette, Under the Pendulum Sun.
OKORAFOR Nnedi, The Book of Phoenix.
ROGERS Jane, The Testament of Jessie Lamb.
SOLOMON Rivers, An Unkindness of ghosts (external link to Black Girl Nerds).
ST JOHN MANDEL Emily, Station Eleven.
TCHAIKOVSKY Adrian, Walking to Aldebaran.
THOMPSON Tade, The Murders of Molly Southbourne.
WILSON Lorraine, This is our Undoing.
WOOD Nick, Azanian Bridges.
WRIGHT Alexis, The Swan Book.