Eight-track project available on iTunes
Davey Havok-led album already completed as new group searches for name and record label
Band will perform for first time since 2011
"Everyone who got asked to sing on our album has an important part in our lives," Chris Martin said of 'A Head Full of Dreams' collaborations
'Gutterdämmerung' trailer features all-star rock and roll cast of Slash, Josh Homme, Grace Jones and Tom Araya in "dark and loud fairy tale"
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