My rule is simple, if you can make it fit in, that is all that matters and I think that some people (not in this thread) can get too fussy over what "belongs" and what doesn't and half the people who moan are clueless anyway. My main instrumet is the tenor banjo and it seems to be readily accepted but the actual tenor banjo which is the most poular form of banjo for Irish music did not exist until round about 1915.

I can't remember hearing a clarinet played in a session but I know somebody who has been known to make a bassoon work very nicely.

Jon