I guess we'll have to agree to disagree, then. Many artists and mash-up artists specifically do not cite their sources in the manner you prescribe on purpose. Part of the enjoyment for me when I listen to mash-up artists is deciphering what exactly it is that is being mashed up. Of course, I cannot instruct you to alter your subjective rating technique. However, I might suggest rating YTMNDs based on how much you like them on a scale from one to five.
