Pink Floyd’s only No.1 hit was written by Roger Waters and was their first single since 1968's ‘Point Me at the Sky’; the song was also the final number-one single of the 1970s. ‘Another Brick in the Wall’ is the title of three songs set to variations of the same basic theme, on Pink Floyd's 1979 rock opera, The Wall, subtitled Part 1 (Reminiscing), Part 2 (Education), and Part 3 (Drugs). The single ‘Part 2’ sold over 4 million copies worldwide. Islington Green School paid for a new gymnasium with the proceeds of the choir’s performance.