When I worked with the music touring business I ran across a few customers I'd never heard of. I remember one particularly I'd not heard of in the US where I live but when visiting Australia my buddy's wife was a big fan of the guy (but can't remember his name for the life of me or even perusing a list of greek artists....sort of a larger/heavier guy popular in the 70s, sang in a really high and annoying voice....which is probably why I can't come up with the name, only worked a bit on his tours).
Demis Roussos?