Babyface's solo career has been gold- and platinum-plated, and his collaborations with other huge names reinforce how his aesthetic has shaped both R&B and pop for decades. Hip-hop superstars like Lil Wayne have called on him to add soul to their rhymes; he gave Jermaine Jackson's solo career a shot of new jack swing swagger; and he's matched wits with world-beating vocalists like Barbra Streisand and Lisa Stansfield.