American act of great popularity in the mid to late 1970's. Their heyday was hemmed in between their two #1 hits: [m=49550], the first single from their debut album of the same name, rose to the top spot in the summer of 1975 and has remained their signature song. They reached the top of the charts again with 1979's [m=49586], which hit #1 in early 1980. In addition, they hosted their own television show on ABC for one season in 1976/77, but quit despite solid ratings to focus on recording and touring. In…