There are loads of websites that give artists the opportunity to sell their music online. Be sure to look into the Terms & Conditions and costs!

CDbaby is one of the most popular Websites for selling your music.
Emubands a digital distribution service which allows unsigned bands and artists to sell their music through major online stores such as iTunes, Napster, HMV Digital, Virgin Digital, Tunetribe.
INgrooves Digital distribution of music. Global distribution service, access to over 400+ online and mobile partnerships all over the world.
IODA Independent online distribution alliance. Comprehensive services for record labels, physical distributors, artists, and filmmakers.
ONErpm A global digital music distribution service and a direct-to-fan social commerce solution for musicians and record labels. Sell Your Music on Facebook. Distribute to iTunes.
Overplay is a music Website dedicated to the promotion and exposure of unsigned bands. It’s a full blown Website that offers a good chance to sell your music online, and yes there is a growing music community.
PayLoadz A secure Digital Goods eCommerce service for anyone to sell downloadable goods online – Sell Downloads – Click Here.
Spotmeup Simple Spotify distribution. Free way of adding your own music on Spotify.
Trackseller manages paid music downloads for musicians of any kind and all around the world.
TuneCore Get your music into all the leading digital stores: iTunes, Spotify, eMusic, AmazonMP3, Google Play… fast and easy, and keep all your rights.