ARP Quadra synthesizers Nick Mason – drums (only in the full version of the song, "What Shall We Do Now?") Roger Waters – lead vocals, bass, VCS3 synthesizer Richard Wright – piano with: James Guthrie – ARP Quadra synthesizer Further reading Fitch, Vernon. The Pink Floyd Encyclopedia (3rd edition), 2005. . References Pink Floyd songs 1979 songs Rock ballads Songs written by Roger Waters Song recordings produced by Bob Ezrin Song recordings produced by David Gilmour Song recordings produced by Roger Waters