Jørgen Ingmann was born on 26 April 1925 in Copenhagen, Denmark. Grethe Clemmensen was born in 1938 in Denmark. They met in 1955, were married in 1956 and got divorced in 1975. Grethe Ingmann died on 18 August 1990 in Denmark.
In addition to Deming's biography: The US success of Jörgen Ingmann's version of Jerry Lordan's instrumental "Apache" (which hit no 1 in US Singles' list in 1961) was largely due to EMI's omission to publish The Shadows' original 1960 version in time for USA. The cover version of the Dane became first and The Shadows' hit could not pace. In subsequent years, Jerry Lordan wrote many other instrumental hits for The Shadows (Wonderful Land, Atlantis, Maroc 5). The Shadows could never really break through in USA, not even in the wave of "British Invasion" in the mid-sixties.