Shine On You Crazy Diamond is a Pink Floyd song that is famously about their ex-lead singer Syd Barrett. It comes from their mega selling album Wish You Were Here which is also apparently a reference to Syd. Syd Barrett is regularly referred to as a 60s 'acid casualty'. That's an old fashioned language that… Continue reading Songs of Empathy and Mental Well Being. No.2 Shine On You Crazy Diamond.