Crowning Music of Awesome: Quite a bit. "Everyday People," "I Want To Take You Higher," "Hot Fun in the Summertime," "Thank You (Falettinme Be Mice Elf Agin)", "Family Affair." Most of Stand! and There's A Riot Goin' On counts as this.
Sampled Up: How many people recognized "Trip to Your Heart" in LL Cool J's "Mama Said Knock You Out?"
Likewise, "Shadrach" by the Beastie Boys is built on a sample from "Loose Booty", from one of the Family Stone's unloved early 70s albums.
Seinfeld Is Unfunny: There simply had never been an interracial/mixed-gender group that had been able to cross over the way they did before them.
Vindicated by History: There's A Riot Goin' On received mixed reviews at the time, for its awesomely downbeat mood; now it's viewed (with Stand!) as their best work, and one of the greatest albums of all time.