On every Project album, Woolfson would sing a guide vocal track for each song, which the album's eventual lead vocalists would use as a reference. Some of these tracks can be heard on the new remastered editions of various Project albums released in 2007. Woolfson himself was the actual singer on many of the Project's biggest hits, such as "Time", "Don't Answer Me", "Prime Time" and the band's signature tune "Eye in the Sky", which peaked at No. 3 on the Billboard Hot 100 on 16–30 October 1982.
