French DJ Guetta usually works with big rock and R&B personalities, but on this bonus cut from the reissue of his 2011 LP, Canadian indie-pop duo Tegan and Sara's sheer, shy vocals give the Guettanator's airy thwump a brave new feel: subtle sensuality.

Listen to "Every Chance We Get We Run":

“Oh Sherrie”

Steve Perry's girlfriend Sherrie Swafford was actually in the studio when Perry began writing this song--his lone Top Ten hit as a solo act--with two co-writers. The trio began at midnight one night with just "Oh, Sherrie!" and "hold on, hold on." Three hours later, they had a complete song. Swafford, however, had to wait until the next day to hear it. "Sherrie actually got tired and went to bed," Perry said. She also appeared in the video, but their relationship did not hold on for long.