I would like to mention AntonyDannecker,he makes harmonicas,hand made harmonicas,and he will retune the reeds,they cost about sterling120 ,much cheaper than a concertina here is a clip of onehttp://ie.youtube.com/watch?v=dE0nP9F1XF8Paul Davis was asuperb chromatic Harmonica player.
Antony Danneker makes one of these for about1000,youcan play all irish music on it,1000 is a lot cheaper than what you have to pay for a good concertina.however if you are a singer,you cant play and sing simultaneously.
   Jim ,I am sending a copy of my cd to the Irish Traditional music archives,I only wish we[myself and Sue] had recorded more of him.