After the release of a new App update, Cook and artist JJ Lin had a bit of a jam session on one of Lin's songs.

Lin, for his part, is a Singaporean singer/songwriter based in Taiwan. He seems to have taken the more challenging section of the song, but it makes sense that Cook would play backup on someone else's music.

No word yet on whether Tim Cook's performance was all for fun, or if he's putting together a collaborations album that will eventually be downloaded onto all of our iPhones without our permission.