This sparkly slow jam literally starts in the club: It's late and Amerie is ready to call it a night. But then she spots club-weary crooner Trey Songz, who offers the leggy songbird his immodest lullaby: "Rockabye baby when the beat drop/ don't let your friends know we about to creep off." When that beat drops and desire goes boom, Amerie and Trey soar, showing that like Donnie Hathaway and Roberta Flack before them, the pair have some serious harmony.

“Let My Love Open the Door”

A peppy, hopeful love song, "Let My Love Open the Door" became a U. S. Top Ten hit for Pete Townshend in 1980, anchored by the kind of repeating synthesizer figures that he'd used in some of the Who's recordings in the previous decade. Although Townshend brushed the song off as "just a ditty" in Rolling Stone shortly after its release, in 1996 he revealed it was about love of the holiest sort. "It's supposed to be about the power of God's love," he remarked. "That when you're in difficulty, whether it's major or minor, God's love is always there for you."