The Beach Boys. From clean cut teenage boys in the 1960s singing about surfing, girls and cars to their use of psychedelics in the late 60s/70s creating one of the most influential albums ever recorded/produced (Pet Sounds) which changed modern recording techniques and practices. Their sound really changed when Brian began experimenting with psychedelic drugs.

Add in a fucked up family life for the Wilsons, with Charles Manson involved with Dennis Wilson, and you get a pretty epic story to go with the music.

Amazingly talented family (the Wilson brothers) cousin Mike Love, and Al Jardine/David Marks/Bruce Johnston.

Their music evolves quite drastically over time.