Barrett, an English singer, songwriter, guitarist, and artist, was one of the founding members of Pink Floyd. The band formed in 1965, and it soon became the most popular group in the “London Underground” psychedelic music scene. As the group’s popularity grew, Barrett began behaving increasingly erratically, and he left Pink Floyd in 1968 amid speculations of mental illness exacerbated by drug use. After a short-lived solo career, Barrett retreated from public life and returned to doing what? Discuss