The Official Katy Perry Divorce Anthem is a predictably effective piece of angsty dance-pop - it was co-produced by Dr. Luke and Max Martin, after all. It's also just plain predictable. The minor chords signal "dark, serious"; the lyrics supply tabloid bait ("You can keep the diamond ring/It don't mean nothing, anyway"). But Perry is best at fluffier stuff; she lacks the gravitas, and the lung-power, to drive the song home. Russell Brand: you can rest easy, mate.

Listen to "Part of Me":
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“Everyday People”

"Everyday People" managed to trailblaze in two different ways -- it was one of the first pop hits to deal with the subject of racial harmony, and it utilized Larry Graham's "slap" technique on the bass guitar, which would soon be copied by countless other bassists. Graham once said about his pulsating style, "I'd never done that before … that's where the freedom of creativity came in for the band, that we'd be allowed to do that." In 1978, the song's line "Different strokes for different folks" would be borrowed for the title of the hit television show Diff'rent Strokes.