"You Ain't Seen Nothing Yet" is a song by Canadian rock band Bachman–Turner Overdrive (BTO). The song was written by Randy Bachman for the band's third studio album Not Fragile (1974). It was released as a single in 1974, with an instrumental track "Free Wheelin'" as the B-side. It reached the number one position on the Billboard Hot 100 singles chart and the Canadian RPM chart the week of November 9, 1974, as well as earning the band their only major hit single in the United Kingdom, peaking at number 2 on the UK Singles Chart. The follow-up single, "Roll on Down the Highway", was also a minor UK hit.