QUOTE(Sebastian Mares @ Jan 13 2007, 01:56)

Maybe because the test administrator doesn't have enough money to buy 20 CDs (it has to be CD or since I don't know of any online store that offers lossless downloads) or doesn't want to get into trouble by illegally downloading the tracks.
Does the test have to involve these specific samples or can you use any few CDs you have flying around (with "challenging" songs in classical, jazz, pop, rock, etc)? Or would this not be enough variance to accurately represent a simple random sample?
And if this is an impossibility, can all the samples be combined into one track (just for encoding), be encoded in VBR, then split again into its component sample pieces for distribution and testing?
I guess I'm just curious at this point; I don't mean to tell you how to do what you do best.