William Lyall (26 March 1953 – 1 December 1989) was a Scottish musician, known for his work with Pilot, The Alan Parsons Project, and the Bay City Rollers.
Born in Edinburgh, Scotland, Lyall was a singer, keyboard player and flautist with Pilot, and co-wrote "Magic", Pilot's 1974 hit single.
In 1979, he contributed string arrangements and synthesizers to an album by the band Runner.
[1] Lyall moved to London in the early 1970s and lived in a red-brick mansion flat in Fitzjames Avenue, West Kensington.
[2] Bay City Rollers' manager Tam Paton later said that Lyall was gay.