They scored two major US and Canadian hit singles. "Fly, Robin, Fly", of which the complete lyrics consisted of only six different words (Fly, Robin, Up, To, The, Sky), maintained three weeks at #1 in late November and early December 1975, and won the group a Grammy Award for Best R&B Instrumental Performance. It sold over one million copies, and was awarded a gold disc by the R.I.A.A. in December 1975. Initially the song was titled "Run, Rabbit, Run", changed by the writers moments before the recording took place. Their next success "Get Up and Boogie", which also consisted of only six different words (Get, Up, And, Boogie, That's, Right), hit #1 in Canada on June 15, 1976, had 3 weeks at #2 in the U.S in June 1976 and also peaked at #7 in the UK, in May 1976. Their next release, "No No Joe," only scored #60 in September 1976. The further singles released by the trio attempted to duplicate the sound that had made them successful briefly, but they were only minor successes. At this time, Linda G. Thompson left the group and was replaced by New Yorker Rhonda Heath, who was chosen over other hopefuls at an open casting call to become the newest singer for the group.