I would second James Conway's and Winslow's advice, to listen to other instruments playing Irish/Celtic music. In particular, Sharon Shannon is worth checking out. She plays button accordian, and her music is impossible to forget, once heard. You can find her CDs at www.greenlinnet.com
Tony Eyers
http://mysite.wanadoo-members.co.uk/trad_irish_harmonica HEAR my CD clips: http://www.gjk2.com/steveshaw/cd.htm READ review of my CD: http://www.irishmusicreview.com/sshaw.htm