The 30-man U.K. Garage collective known as the So Solid Crew combined elements of house, grime, drum & bass, R&B, and hardcore hip-hop on their versatile major label debut, THEY DON'T KNOW. The crew's resident diva Lisa Mafia's melodic hooks add equilibrium to the seemingly endless barrage of high-energy male MCs (M.A.C., Megaman, MC Harvey, Asher D, Romeo, among many others) whose furious rhymes rock over heavy bass-driven beats. THEY DON'T KNOW features the smash singles "Oh No," "21 Seconds," "They Don't Know," and "Haterz"; and works as perfect primer and overview of the U.K. hip-hop scene at the turn of the 21st century.