The problem with online downloads (other than that they are easily shared and not everyone wants that) is that they tend to separate the song from the collection. This means (a) potentially less money for Mudcat if someone only buys the few songs they're most interested in and (b) it could take income away from artists who have or plan to include the tracks they are donating as part of other projects. For this reason, I would suggest that any downloads be whole CD only, and not by the individual song.

Dan