First recorded by Bay City Rollers (1973).
Hit version by Bay City Rollers (1974 |US #1/CAN #1/GER #2 1975).
From the wiki: “‘Saturday Night’ was written and produced by Bill Martin and Phil Coulter, and first recorded by Bay City Rollers – with lead vocals by Nobby Clark – in 1973 with no apparent chart impact. The song was then re-recorded by the Rollers’ for their 1974 UK album Rollin’ with lead vocals by Nobby’s replacement, Les McKeown. At the end of 1975, ‘Saturday Night’ was released as a single in America and it hit the #1 spot on the Billboard Hot 100 in January 1976. The song did not chart in the UK.”
Bay City Rollers, “Saturday Night” (1974):