Somewhat to this question, would any audiophiles here care to weigh in on the quality of MP3s bought for download from Amazon? Also, is there any other source with a comparably large catalog?
For classical music and jazz, I have found Presto Music to be a good place to buy mp3s. The search function works well, and many classical albums come with liner notes in PDF booklets.
Presto also offers FLAC downloads, but I can't hear the difference on the equipment I use so I buy the cheaper mp3s.
I have also bought mp3s from Amazon. I didn't have any problems with the sound quality.