Also, Soundgarden's new 'Ultramega OK' reissue, Greg Graffin's 'Millport' and Rhiannon Giddens' 'Freedom Highway'
Soundgarden singer pens track for upcoming movie about love triangle during Armenian genocide
Band also at work on follow-up to 2012's 'King Animal'
Bonus disc to feature previously unreleased music by Chris Cornell, Paul Westerberg, Mudhoney and Pearl Jam's Mike McCready
Supergroup of Soundgarden's Chris Cornell and members of Rage Against the Machine perform together for first time in nearly 12 years
Band's "correction" of 1988 debut LP includes six-track 'Ultramega' EP, featuring early versions of classic tracks
Expanded classics, unearthed obscurities and other historical gems
Guitarist on digging through archives, meeting Johnny Cash and how band found its unique groove on 1991 LP
It's one of the few times in his life the Soundgarden frontman has performed a Pearl Jam song
Supergroup of Soundgarden and Pearl Jam members also stage live debut of 'Superunknown' outtake "Missing"
Grunge supergroup also perform Mother Love Bone, 'Temple of the Dog' tracks at band's first official concert together
Soundgarden vocalist joins singer-songwriter onstage at Los Angeles concert
Band details mega 'Badmotorfinger' reissue, due out this fall, to mark album's 25th anniversary
Guitarist Kim Thayil says 'Badmotorfinger' is the "most exciting thing in the next few months" for band
Chris Cornell, Mike McCready and Jeff Ament look back at pivotal grunge supergroup, and ahead to their upcoming tour