Re Claiming credit for traditional tunes etc. I remember reading once that a singer (was it Pete Seeger?) was asked, after recording a song, who composed the tune, and replied Traditional. The other guy then said, well for Chr*st's sake claim at least that you arranged it, otherwise the record company get to keep ALL the money. So the motive for claiming credit seems to have been that you get paid more, and otherwise it's the company who benefit.