In Pictures: 20 clever apps and services that make great use of the Cloud

Lots of mobile apps and Web services are available to help people who want all their digital content - not just documents - at their fingertips at any time. We look at 20 that are fun, useful, or both.

8tracks

Category: Music

Why You Need It: 8tracks is a social radio network in which music aficionados upload MP3s, create playlists with eight or more tracks, and add cover art plus descriptions and tags that indicate genre or mood. Tune in to these radio-style playlists, and you'll find that they frequently have better selection and variety than what you get through algorithm-based Internet radio services.

8tracks | Free; subscription to ad-free 8tracks Plus costs $25 for six months | Android, iOS, Web service, Windows Mobile, Flash/HTML 5 embeddable widget

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