This topic is discussed on The Chiff&Fipple from Tony Mc Mahons rant about sessions.

Twenty guitars sounds to me like a real party ...bring that on .. zouks ok no problem, bodhrawns only if they are in tune, and please don't have some flute player slobbering drunk upon my Martin!

So play it your own way - to hell with the dry boring shlop that often poses as the real Mc-Coy, if in doubt go listen again to Cooley, Collins, Coleman, Dennis Murphy & Julia Clifford, Willie Clancy, Noel Hill, - then apply yourself to playing tunes.