That's a fair opinion.  People are of course free to listen in any compressed form that they want, just as they are when they rip CDs or download songs off of iTunes.  But I don't think you should be pushing MP3 over FLAC/WAV as you are with the link to the Archive, because a lossy format does degrade the quality of the music.  That's why MP3 is not consistent with etree standards (etree supports both of the web sites to which you linked).  Also, WAV can be burned onto CD or downloaded onto an iPod.