"I Try" singer adds raspy soul to pop star's 'Dangerous Woman' ballad "Leave Me Lonely"
Unlikely vocal pair get soulful on latest 'Dangerous Woman' release
"Come save the world with me," singer beckons in "All I Want For Christmas"
The R&B diva credits Billie Holiday as her biggest influence
Singer says she loves Arcade Fire, My Chemical Romance
Gray on crossing genres: 'I imagine if I was a metalhead, I would feel bad about rearranging James Hetfield'
Also: Electronic music pioneer Milton Babbitt dies at 94; Ricky Martin announces tour
As Rolling Stone celebrates its People of the Year issue, Mick shows another side: more personal, more spiritual, and solo