Canadian iPod Tax Challenged

It seems that nobody is happy with the recent Canadian Copyright Board’s decision to maintain the current tax on recordable media and expand it to MP3 players like the iPod and Rio according to articles on CNET and in the Toronto Star. What I can’t figure out is that if I bought a song from someplace like Puretracks, iTunes (although not yet available in Canada) or loaded up my iPod with songs from my CD collection, hasn’t the artist already been compensated? If so then why am I paying an extra 25 bucks? We should all go back to cassette walkmans. Things seemed so much easier back then in the ‘80s!
Later.