Songfacts: The Bay City Rollers were a Scottish boy band who scored their first UK hit in 1971 with "Keep On Dancing." In 1975, they had the UK's best-selling single with "Bye Bye Baby," and were primed to break through in America. This infectious Pop song, with its very memorable chant (S-A-T-U-R-D-A-Y... Night!) stormed the States, becoming the first US #1 hit of 1976 (America's bicentennial). The song got a huge publicity push, and the band made their US TV debut performing the song on Saturday Night Live with Howard Cosell, which was an Ed Sullivan-style variety show that lasted just a few months, but had a huge viewership since there wasn't much else to watch.