BT Express--Do It ('Till Your Satisfied) (1974)

     For those who didn't live through it, (and for many who did) the disco era began with "Saturday Night Fever". Actually SNF was the apex of the era, since the sound from the dance floor began to filter on the charts for a couple of years before what is considered "the disco era". For me, this song was one of the songs that began that move.
     BT Express (which stands for Brooklyn Trucking Express) started out as the R&B group Madison Street Express in 1972 and changed the name with the release of "Do It". It reached #2 on the charts in the fall of 1974, and continued to charts for the next two years.