I'm getting confused now. If they are in waltz time, they're not in 3/2, are they? I'm thinking (and I think Mary is too) of tunes like 3/2 "hornpipes", which you couldn't possibly waltz to - Rusty Gully, for example.

I suppose all it takes is for some prominent ceilidh band to invent a dance that works with a 3/2 rhythm and then promote it at their dances, by demonstrating it and encouraging others to copy it. At a festival, for example, there would be lots of dancers keen to give it a try, and other bands around to watch and learn.

I agree, there are some cracking tunes out there, and it must be possible to invent or rediscover a way of dancing to them.

Marje