The disc climbed all the way to number one in the UK Singles Chart. However all follow-ups sank without trace, and the group became known there as a one-hit wonder. In their U.S. homeland, additional revivals in the same vein as "Blue Moon" - "Heartaches" and "Melancholy Baby" - were less successful, although the former peaked in the Top 10 of Billboard Hot 100 singles chart and eventually sold over one million copies worldwide.
In August 1961, due to problems encountered in the Deep South while touring because of the group being bi-racial, the white members, Knauss and Bricker left and were replaced by Allen Johnson (brother of Fred) and Walt Maddox. Mundy left soon after, leaving the group a quartet.
In 1962, Harp and Allen Johnson left, and were replaced by Richard Harris and William Herndon. There was a brief reunion of the original members in 1973. The group made several recordings in 1975 with Harp back on lead.
Original member Gene Bricker died in 1983. Allen Johnson died in 1995.
By the early 1990s the group included Johnson, Maddox, Harris, Jules Hopson, and Richard Merritt.
The group split around 1995. Fred Johnson formed his own group with new members, while the other four members recruited new bass Ted Smith. Maddox won a lawsuit against Sunny James Svetnic, the manager of Johnson's group, for trademark infringement in 1996. Svetnic died in 2002.