Formed as a jazz ensemble in the mid-'60s, Kool & the Gang became one of the most inspired and influential funk units during the '70s, and one of the most popular R&B groups of the '80s after their breakout hit "Celebration" in 1979. Just as funky as James Brown or Parliament (and sampled almost as frequently), Kool & the Gang relied on their jazz backgrounds and long friendship to form a tightly knit group with the interplay and improvisation of a jazz outfit, plus the energy and spark of a band with equal ties to soul, R&B, and funk. Robert "Kool" Bell and his brother Ronal...