iTunes U.S.

iTunes Canada

iTunes U.K. / E. U.

iTunes Australia / New Zealand

iTunes Japan

iTunes Mexico

eMusic (U.S., U.K. / E. U.)

Rhapsody (U.S. only) (temporarily suspended, it'll be back)

Napster (U.S., Canada, U.K. / E.U.)

Amazon MP3 (U.S., U.K., Germany, France, Austria, Switzerland)

Amazon on Demand (physical) (U.S. only, but can ship internationally)

ShockHound (U.S. only)

Nokia (Australia, Mexico, Switzerland, Austria, Netherlands, United Arab Emirates, Brazil, Norway, United Kingdom, Finland, Poland, France, Portugal, Germany, Singapore, India, South Africa, Ireland, Spain, Italy, Sweden)

IMVU / GroupieTunes (U.S. only)

Zune (U.S. only)

MySpaceMusic (U.S. only)

ThumbPlay (U.S. only)

MediaNet (World)

Spotify (Finland, France, the Netherlands, Norway, Spain, Sweden and United Kingdom)

iTunes stores:

Australia

Austria        

Belgium

Canada        

Denmark

Finland                

France

Germany

Greece

Ireland

Italy

Japan

Luxembourg

Mexico

Netherlands

New Zealand

Norway

Portugal

Spain

Sweden

Switzerland

United Kingdom

United States