mmario said: "but - we DO NOT know all the composers of recent songs. or at least the people performing songs do not necessarily know the composers or derivations. I know of at least two or three songs that I have heard performed and attributed to "traditional/anonymous" that I know were composed within the last few years(and I know who composed them)."

you see, that proves my initial point. the collective "we" does know who wrote the songs in question. the fact that you knew the identities of the composers just says that the performers in question did sloppy (or no) research before their performance.