Crosby, Stills & Nash is an American folk rock supergroup formed in 1968. The trio consists of David Crosby, Stephen Stills, and Graham Nash. They are known for their harmonious vocals and intricate songwriting, which blend elements of rock, folk, and pop music. The group gained fame with their self-titled debut album, which included hits like "Suite: Judy Blue Eyes." They later expanded to a quartet by adding Neil Young, becoming Crosby, Stills, Nash & Young. Their music often addresses social and political themes, making them influential figures in the 1960s and 1970s music scene.