Tell your mother, tell your father, send a telegram.
So far my favorite is Tribe. The upright-bass lines and the jazz horns were initially what set them apart, but Q-Tip and Phife also just have really soothing voices. Rhymes just roll off their tongues through Midnight Marauders. The repeating three-bar phrase in "Electric Relaxation" is nontraditional and trance-like. They make it seem really easy, which I like a lot more than the boasting-rap of Kanye, Weezy et al.
Here's "Steve Biko (Stir It Up)" & "Luck of Lucien":