In 1979, Pink Floyd made the biggest hit they ever had. During their reunion, David Gilmour refused to play it

Pink Floyd reunited for Live 8 in 2005 after years of tension between David Gilmour and Roger Waters. Gilmour refused to include the band’s hit “Another Brick in the Wall”, saying he did not regard it as part of their strongest work; the reunion was also intended to raise money for children affected by poverty.

Waters contacted Gilmour about performing, and the musicians agreed on a set despite differences over song choices and arrangements. The article says both later performed “Another Brick in the Wall” at charity events, but it was left off the Live 8 setlist, where its lyrics about not needing education may have seemed at odds with the event’s focus on funding education.