Murray, it must be a matter of individual experience. My problem in trying to work up duets with women singers generally goes the other way. We keep finding that we sing the same song in the same key, or keys that are very close (one in D, the other in C, for example). This means that if we are going to do harmony, one of us is going to have to sing in a range that is either lower or higher than is comfortable for us. Probably just happenstance and the luck of the draw.

Don Firth