Dave & Sugar was a pop-styled American country music trio which enjoyed its peak success in the mid- to late-1970s. The trio consisted of lead singer Dave Rowland and initially on backing vocals, Vicki Hackeman and Jackie Frantz. Over time, the female members ("Sugar") of the group changed: Frantz was replaced by Sue Powell in 1977, who in turn was replaced by Jamie Kaye in 1980, while Hackeman was replaced by Melissa Dean (Etta Britt) in January 1979. Overall, Dave & Sugar charted 16 times on the Billboard country charts, including three No. 1 hits: "The Door Is Always Open", "Tear Time" and "Golden Tears". Powell also had two chart singles outside the group.

Source: Wikipedia (https://en.wikipedia.org/wiki/Dave_%26_Sugar)