Linda Perry has released the original song The Letter from the Hulu documentary Kid 90. The track is written and performed by the singer/songwriter/composer (best known as a member of the former rock band 4 Non Blondes) who also scored the film. The song is now available as a digital single on Amazon and any other major/digital music service. Also listen to the full track after the jump. Kid 90 is directed by Soleil Moon Frye and centers on a group young Hollywood stars (including David Arquette, Brian Austin Green and Mark-Paul Gosselaar) growing up in the 1990. The movie premiered last week and is now available to stream on Hulu.