Oh, come on, GUEST, brass should be banned from folk music? Lots of "the folk" of times past played in brass bands. Trumpets have been around a lot longer than concertinas. Anyway, if we're going to start purging instrumentation, why stop at brass - why not guitars, why not accordions, why not pianos, why not any vocal that resembles modern speech and phrasing? Why not prevent all broadcasts and recordings of folk music because these are new and therefore "inauthentic"? Living traditions surely have to have room for experimentation or they're museum pieces.