The crossword solution for the term 'Pink Floyd's Barrett' is SYD, which is a reference to Syd Barrett, the founding member of the English rock band Pink Floyd. Barrett was the lead singer, guitarist, and songwriter for the band from 1965 to 1968, and his influence on the band's sound and style was significant. He left the band in 1968 due to mental health issues, but his legacy lives on in the music of Pink Floyd.