Since helping define Motown's sound in the ‘60s, Detroit's Four Tops have adopted a cross-genre approach to hitmaking. Their swinging soul and tight R&B riffs crop up in The Impressions' smooth output and New York City's irresistible hooks, while their disco leanings show up in the funk-fueled Philly group Blue Magic. And if you're tracing their pop legacy, look no further than Wham!