Sierra mainly plays the guitar, piano and harp, and contributes vocals. Bianca sings and manipulates various children's toys/electronic & percussion instruments.

CocoRosie performs as a duo and also with other backing musicians on occasion, usually a bassist and either a drummer or beatboxer.

...in a bathroom in Paris we found ourselves. Steamed up windows, infinite rainy days, the kettle's constant hiss and the weary moan of a dying ambulance summoned songs from another time...

We had split apart as sisters, abandoned one another and led completely different lives, gathering contrasting influences and tools that were unknowingly building towards the birth of CocoRosie.

Sierra began her exploration of singing with gospel and spirituals, and continued her devotion studying as an opera singer starting in high school. She received severe beatings from fat divas in Rome, NY and Paris, and although she attained many accolades from the world of classical opera she felt something was missing, some thirst that opera alone could never quell...

Bianca started writing songs at nine; bad love songs, poems, stories, to do lists... kept writing...tattoos, got lost in sociolinguistics, politics, fetishes... She began singing acapella; in the shower, on the corner, in dimly-lit squats and speakeasies. She fled to Paris on a whim.

Desperate, spontaneous, from the Paris airport, Bianca calls to say; "Can I come stay a while?" Sierra asks why...

We had spent our lives on separate planets, despite the fact that we shared the same child life, and this unplanned rendezvous was like a blind date arranged by angels.

So over the next eight months, tucked away in a Paris shoebox, listening to the rain, we made La Maison de Mon Rêve and CocoRosie was born.

La Maison de Mon Rêve is deceptively innocent: enchanting and sweet yet eerie and twisted. An acoustic guitar paints melody through a haze of cryptic sounds and perversely angelic voices. A broken radio transmits a music box orchestra. Tiny field mice sing gospel.

CocoRosie is Bianca and Sierra Casady. Sierra sings and plays guitar and flute. Bianca sings and does percussion (rattles things, makes things squeak, shakes a gold chain belt). They write all the music together.

La maison de mon rêve (French: The house of my dream) is the first released album by CocoRosie, released on March 9, 2004 by Touch and Go Records.

1. "Terrible Angels" - 4:10
2. "By Your Side" - 3:59
3. "Jesus Loves Me" - 3:10
4. "Good Friday" - 4:23
5. "Not For Sale" - 1:19
6. "Tahiti Rain Song" - 3:36
7. "Candyland" - 2:56
8. "Butterscotch" - 3:08
9. "West Side" - 1:24
10. "Madonna" - 3:49
11. "Haitian Love Songs" - 4:55
12. "Lyla" - 4:04

Noah's Ark is an album by CocoRosie, released in 2005. The album includes collaborations with Antony Hegarty from Antony and the Johnsons ("Beautiful Boyz"), Devendra Banhart ("Brazilian Sun") and French rapper Spleen ("Bisounours").

1. "K-Hole" - 4:10
2. "Beautiful Boyz" - 4:37
3. "South 2nd" - 4:09
4. "Bear Hides and Buffalo" - 4:14
5. "Tekno Love Song" - 3:54
6. "The Sea Is Calm" - 3:39
7. "Noah's Ark" - 4:13
8. "Milk" - 0:34
9. "Armageddon" - 4:04
10. "Brazilian Sun" - 4:38
11. "Bisounours" - 4:06
12. "Honey or Tar" - 2:08

The Adventures of Ghosthorse and Stillborn is the third full length studio album by CocoRosie, released on 10 April 2007.

1. "Rainbowarriors" - 3:55
2. "Promise" - 3:37
3. "Bloody Twins" - 1:37
4. "Japan" - 5:02
5. "Sunshine" - 2:58
6. "Black Poppies" - 2:37
7. "Werewolf" - 4:50
8. "Animals" - 6:02
9. "Houses" - 2:56
10. "Raphael" - 2:48
11. "Girl and the Geese" - 0:46
12. "Miracle" - 3:35 (UK edition = 11:36 due to including bonus track Childhood)