In this month’s edition of Unexpected Musical Collaborations at Random Youth-Orientated Festivals, we present Billy Idol and Miley Cyrus, who teamed up to perform an electrifying rendition of Idol’s famed 1983 tune “Rebel Yell†at the iHeartRadio Music Festival last night. Cyrus — who’s serving as The Voice’s resident cool judge right now — was a surprise guest, handling the second verse of the song while decked out in an impressive Idol-themed outfit. It wasn’t in the midnight hour, though, more like 9:00 p.m. PST.