BTO - You Ain't Seen Nothin' Yet - American Bandstand June 17 1978

"On November 9, 1974, Bachman Turner Overdrive went to No.1 on the US singles chart with 'You Ain't Seen Nothin' Yet'. Randy Bachman stuttered through the lyrics of the demo recording as a private joke about his brother Gary, who had a speech impediment. The record company liked that take better than the non-stammering version and released it."