Surprisingly, although they had many number one albums, when it came to singles, Pink Floyd only had one number one hit in the UK, the US and elsewhere, and this was it!
It was released in 1979.
Pink Floyd - Another Brick In The Wall, Part Two
More info on Wikipedia:
https://en.wikipedia.org/wiki/Another_Brick_in_the_Wall
https://en.wikipedia.org/wiki/Pink_Floyd_discography