Stew,

I wasn't taking a dig or being critical in any way. I guess what I was saying was which came first ? the chicken/duck or the egg ?

I was at a session once where a banjo and guitar duo were playing Flop Eared Mule, an English girl concertina player joined in and was there all the way. When the tune finished the banjo player said to the girl "I didn't know you played Flop Eared Mule", she said "I don't, I was playing Bluebell Polka".

I've also heard two fiddlers playing together, one playing Home Sweet Home while ther played Silver Bells. Easy to see how the A part of one tune can be fitted to the B part of another unless you have a photographic or should that be phonographic memory.

Whatever you play and whatever you call it just enjoy it.