Services
There are many different digital delivery services that focus exclusively on music, the most prominent of which are Rhapsody, iTunes, and Zune.
Formats
Most digital delivery services offer music in a preferred format, which may include WMA, AAC, MP3, or MP4.
Device Compatibility
Because most music devices only support a few music formats, it is very important that you check and see if your personal music player supports the preferred format of the music download service you use before subscribing or purchasing music.
Digital Rights Management
Digital Rights Management, or DRM, is a series of code that is tacked on to downloaded music to prevent illegal distribution.
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