Kunz was born in Allentown, Pennsylvania, the only son of Margaret T. (Wehr) and Leonard Kunz, a master baker who played the French horn. He made his debut aged six and made his first appearance as a prodigy aged seven. During World War I he led his own resident band, while working in a munitions factory.
He came to England in 1922 as a pianist in a small dance band. He was to remain here until his death from a heart attack in 1958. He is buried in Streatham Vale Cemetery. He was such a distinctive and popular pianist that he abandoned his orchestra to concentrate on his piano playing, both at music hall venues and on the BBC. Two of Britain's most famous female vocalists were with his orchestra in the 1930s: Vera Lynn and Welsh songstress Dorothy Squires.
Casani Club Orchestra dir. by Charlie Kunz - Swing Time part I & II