I'd say piano accordion is far more common than button in Scottish music . . indeed, it seems to be the "standard" instrument for the Scottish Country Dance movement. And wasn't Jimmy Shands a piano accordionist?

One to listen out for is Ian Lowthian . . in particular the Catriona Macdonald (fiddle)/Ian Lowthian (piano accordion) albub "Opus Blue" is as good as "Celtic" (I hate that term!!) music gets. Sadly it's on Dave Bulmer's Celtic Music label, so many decent distributors don't stock it.

Another band is Flook! (www.flook.co.uk) (the albums "Live" and "Flatfish"); while there's not a great deal of accordion on their albums the CDs are absolutelyn excellent - and the accordion playing is wonderful.

George