Syd Barrett was a British musician, singer, songwriter, and guitarist who was a founding member of the band Pink Floyd. He was known for his innovative and experimental musical style, which included psychedelic rock and acid rock. He was also known for his eccentric behavior and lifestyle. Barrett left Pink Floyd in 1968 and released two solo albums before retiring from the music industry in 1972. He is remembered as one of the most influential and iconic figures in the history of rock music. The crossword solution for 'Guitarist Barrett' is SYD, a three-letter abbreviation of his first name.