Billy Lyall (born William Lyall, 26 March 1953, Edinburgh, Scotland – died December, 1989) was a Scottish musician.
He was a keyboard player and vocalist with Pilot and an early member of the Bay City Rollers. He also contributed to The Alan Parsons Project with fellow Pilot members. Lyall died of AIDS-related causes in 1989 . 
- Uhelszki, Jaan. "Courtney to Get Behind the Camera", Rolling Stone, 1999-10-25. Retrieved on 2006-10-04.
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