This article is from the Anime Music FAQ, by Ru Igarashi with numerous contributions by others.
Many people say they use MP3s to get an idea of what's on a CD before they decide to buy it. There is a school of though that says the more ethical way of providing this is by provding exerpts from any given track rather than the whole track (for example, see WHAT'S THE RECOMMENDED WAY OF PRESENTING MUSIC SAMPLERS ON MY WEB SITE?). The following provide that service to anime music fans. [maintainer's note: this REALLY needs more entries]
CDJapan:
The audio/video retailer in Japan has samples for some of the CDs they sell. They usually have a link on the CD's details page. http://www.cdjapan.co.jp/
For Yoko Kanno's works:
The Yoko Kanno Project http://jameswong.com/ykproject/ http://jameswong.com/ykproject/disc/music.php
 
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