Pink Floyd drummer Nick Mason made a surprise guest appearance on stage at his former colleague Roger Waters' Wembley Arena show in London last night (June 26).

Pink Floyd drummer Nick Mason made a surprise guest appearance on stage at his former colleague Roger Waters' Wembley Arena show in London last night (June 26). Mason played on Waters' version of the early Floyd composition "Set the Controls for the Heart of the Sun." The reunion marked Waters' first collaboration with any of his former bandmates since his acrimonious departure from Pink Floyd in 1983, and was greeted with standing ovations from the Wembley audience both before and after the song.

Billboard.com understands that Waters and Mason, who have remained on good terms despite the ill feeling caused by the band's subsequent use of the Pink Floyd name, met again by chance last December on the Caribbean island of Mustique. Two weeks ago, Waters telephoned Mason to invite him to guest at the show.

On Sunday, Waters will play the Pyramid Stage at the Glastonbury Festival (on the same day and stage as Rod Stewart, Isaac Hayes, Badly Drawn Boy, and others). It will mark the end of an international tour of more than 50 dates, which started in South Africa in late February and has played in such locations as Santiago, Osaka, Seoul, Sydney, Bangalore, and Beirut.

Waters' official Web site says that his next rock album will be released in 2003. Work also continues on his longtime project "Ca Ira," an opera in French and English.