TLC were no strangers to radio play after their hit 1992 debut album, but their 1994 follow-up rightfully transformed them into one of the biggest-selling girl groups of all time. Incorporating a sleek, funky new sophistication into their sound—and updating the juvenile vibe of their previous record with a grown-up sexuality—the Atlanta-based trio hit the R&B jackpot with unstoppable singles like “Creep” and “Red Light Special.” We’re still moved every time we hear the jazzy cautionary tales in “Waterfalls;” its video, depicting the consequences of drug violence and unprotected sex, is unforgettable.