...those who rely on the radio for guidance on what type of music to purchase and don't want to hear anything that is unfamiliar or challenging. These trendies will buy the latest release from Elton John, Madonna, Spears, etc, because those releases are selling and everyone else is listening to them...
...and those who are a little more discriminatory when it comes to music purchases.
Generally, I think those in the first group are more likely to download songs and not purchase CDs.
I haven't bought a CD from a major label in years(excluding classical). Not be design, just seems that all the artists I like are on small labels.
DING DING DING...!!! We have a winner!!