Indie rock giants Soundgarden recorded their first new track in fifteen years as part of the soundtrack to Disney’s upcoming adaptation of Marvel’s The Avengers, due in theaters on May 4. The anticipated song was teased by Rolling Stone before finally being released but is now free as part of a cross-promotion between iTunes and The Avengers. The soundtrack itself is $9.99 at iTunes, but fans who pre-order the album will find themselves on a customized page in the iTunes store where they’ll be able to watch the Black Widow clip, plus an “exclusive” clip which showed up on
