Since October, the Flaming Lips have been offering hints regarding their collaborative Record Store Day release. Now, we have the full details of the compilation, which is called The Flaming Lips and Heady Fwends and features collaborations with Bon Iver, Erykah Badu, Nick Cave, Yoko Ono, Neon Indian, Ke$ha, Prefuse 73, Tame Impala, Jim James of My Morning Jacket, Lightning Bolt, Biz Markie, New Fumes, Chris Martin of Coldplay, and Edward Sharpe and the Magnetic Zeros. It's out on Record Store Day, April 21.

The recordings document "a series of unique and experimental sessions," according to a press release, and will be released in a very limited edition and never pressed again. The album comes as a 2xLP on multicolored vinyl, each disc with a unique design. A number of the tracks included have been culled from the Lips' previous collaborations with Neon Indian, Lightning Bolt, Prefuse 73, and Yoko Ono.

Mastodon will also be covering "A Spoonful Weighs A Ton" by the Flaming Lips for a Record Store Day 7" single this year.

Watch the Flaming Lips and Neon Indian perform their collaboration live after the tracklisting.

The Flaming Lips and Heady Fwends:

Side 1:

01 2012 (featuring Ke$ha and Biz Markie)

02 Ashes in the Air (featuring Bon Iver)

03 Helping the Retarded to Know God (featuring Edward Sharpe and the Magnetic Zeros)

Side 2:

04 Supermoon Made Me Want To Pee (featuring Prefuse 73)

05 Children of the Moon (featuring Tame Impala)

06 That Ain't My Trip (featuring Jim James of My Morning Jacket)

07 You, Man? Human? (featuring Nick Cave)

Side 3:

08 I'm Working at NASA On Acid (featuring Lightning Bolt)

09 Do It! (featuring Yoko Ono)

10 Is David Bowie Dying? (featuring Neon Indian)

Side 4:

11 The First Time Ever I Saw Your Face (featuring Erykah Badu)

12 Thunder Drops (featuring New Fumes)

13 I Don't Want You to Die (featuring Chris Martin of Coldplay)