on the radio.' "

Avicii shot to No. 4 on the Hot 100 with country-fried EDM track Wake Me Up! in summer 2013, thanks in part to the soulful voice of then-newcomer Aloe Blacc (who also co-wrote the track). Talking to Billboard later that year about his anonymous vocals, Blacc said that "it's bittersweet for the fans' sake. ... But I like the discovery. When I was a young kid, I loved the song called Somebody's Watching Me (by Rockwell), and I had no idea until much later that my favorite singer, Michael Jackson, was singing on the chorus. So you never know."

Apparently, the White Duke likes Canadian indie rock just as much as you do. Bowie joined the Grammy-winning band onstage for a performance of song Wake Upin 2005, but also "supplied a brief backing vocal" on disco-inspired single Reflektor when it was released in September 2013, according to a Facebook post. Coming by the studio while they were mixing, Bowie "offered to lend us his services because he really liked the song," band member Richard Reed Perry told NME at the time. "In fact, he basically threatened us – he was like, 'If you don't hurry up and mix this song, I might just steal it from you!' "

The second single from Jay Z's 2001 The Blueprint album already featured rappers Q-Tip, Biz Markie and Slick Rick, but got an extra boost of background vocals from the King of Pop himself, the hip-hop titan revealed in a 2009 op-ed for NME paying tribute to