Since its introduction in the 1970s, hip-hop has become a way of life. This title takes an inside look at the groups of hip-hop. Hip-Hop Groups follows the careers of hip-hop's top group acts, examining their contributions to the genre as it burst into the mainstream and went global. Features include a timeline, a glossary, essential facts, references, websites, source notes, and an index. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.