If competing hip-hop cliques ever need to find common ground, they can cite this jazz-funk outfit. Beginning with their early ‘70s embrace of electric bass and guitar, The Crusaders hit on a style that would later form the basis of tracks by 2Pac, Guru, and KRS-One (whose “Squash All Beef” is built atop “Mystique Blues”). This playlist gives you the original grooves, followed by rap adaptations.