[1] They signed to Brian Epstein in 1966, were renamed to The Cyrkle by him[2] (the unique spelling of the name being done by John Lennon) and released their highest-selling song "Red Rubber Ball" (written by Paul Simon) the same year.
After another hit with "Turn-Down Day", they disbanded in 1968, and had already split up by the time the 1970 film The Minx, which they had recorded the soundtrack for, had been released.
[6] In the 1970s, Dannemann and Cyrkle member Tom Dawes worked as professional Jingle writers.
[7] Dannemann spent the next few decades working in advertising, and in the 1970s, opened the jingle business "Mega-Music" in New York City.
In the 2010s, original member Michael Losekamp successfully tracked down Don after over forty years.