Look out, it's Feistodon! Feist and Mastodon have released the cover art for their Record Store Day collaboration.

The creepy image features pasted-together images of the band members under the 'Feistodon' label.The morphed figure has a hand-drawn black tongue, signifying Feist's cover of the Mastodon track 'Black Tongue.'

The other half of the record will be Mastodon's cover of Feist's 'A Commotion,' a song from her latest album, 'Metals.' Feist tells Rolling Stone, "It's a wet dream to have Mastodon take one of my songs and put it into their massive machine."

Feist adds, "Mastodon fans would probably be disappointed to know that I actually didn't know Mastodon very well. I actually went onto one of those lyric websites, and I scrolled through 50 songs and just narrowed it down to the ones I thought I could wrap myself around the words. 'Black Tongue' is speaking in my kind of elemental language – about diamond and earth and sky. It's all just in a language that I already sort of speak lyrically. It was pretty easy to climb into that one."

The 7" single will be available on Record Store Day -- Tuesday, April 21. A number of bands have recorded special tracks for the event. Mastodon are also releasing their version of the Flaming Lips' 'A Spoonful Weighs a Ton.'