Pavane - that's what I thought. But it would appear that plenty of performers don't appear to know this (or maybe they fill in their PRS forms properly but don't mention the arrangers to the audience?? Unlikely methinks but you never know)

jonm - either of those sound like perfectly reasonable approaches to me, it's only when it is a blatant cover and no credit is given for the arrangement that my hackles start to go up. Nowt wrong with learning trad songs from other people's recordings (a goood source of material in this day & age) or with perfomring others' arrangements of them so long as you tell the audience where its from.

James