For Irish stuff, I'm very fond of John Williams; he's very expressive. And a really enjoyable album of accordions and fiddles is "Buttons and Bows." For interesting weird stuff you might have a listen to Pauline Oliveros. Margaret (who couldn't stop herself from buying a perfectly good piano accordion for $10.00 at a garage sale in Wisconsin, but who has mostly spared her neighbors in New York -- who just wouldn't understand -- from having to listen to her try to learn. . .)