Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
Unlike the iTunes Store, which requires installing proprietary software to access, you can get to the Amazon MP3 Store from any web browser (no proprietary software needed, as with iTunes). Just go to www.amazon.com/mp3/ and you’re in.
At present, the Amazon MP3 Store has more than 18 million tracks for downloading. All its tracks are in MP3 format, with variable bitrate encoding. They aim for an average 256Kbps bitrate, which is near the top end of what you can expect from the MP3 format. Cover art files are included with all downloads.