Pink Floyd’s album Wish You Were Here is peculiar. While most rock albums have around 10 to 12 songs, this one only has five—two of which are split into multiple parts. When it came out in 1975, the idea was to make something nonconformist, something that reflected the corrosive effects and alienation of the music industry. The Dark Side of the Moon was behind the band; they were more seasoned now. They also wanted to pay tribute to their co-founder and former frontman Syd Barrett, whose deteriorating mental health had led him to leave. “Shine On You Crazy Diamond,” split across the album, addresses Barrett: “Remember when you were young, you shone like the sun.” In time for its half-century anniversary, the album has been re-issued. —Elena Clavarino