“Doin’ It” is one of LL Cool J’s most commercially successful singles and a defining example of mid-1990s hip-hop’s sensual crossover appeal. Built around a prominent sample of Al B. Sure!’s “Nite and Day,” the track pairs a smooth, laid-back groove with playful, explicit lyricism centered on romance and intimacy. Released as the lead single from Mr. Smith, the song topped the Billboard Hot Rap Singles chart and became a major mainstream hit. “Doin’ It” exemplifies LL Cool J’s ability to balance street credibility with pop accessibility, solidifying his status as a pioneer of romantic hip-hop.