" . . . nonsensical artificial boundaries which allow colectors to collect tin pan alley rubbish because it has been learned orally,but reject a song that the traditional singer may have written himself because it has not been learned orally or not been folk processed,regardless of the quality of the song."

Don't know where you get these ideas. Point of fact, many folklorists chose not to record the 'tin pan ally' type stuff sung by many traditional singers, but I can't think of many collectors who rejected original songs from the same singers.