A look at 3 subscription plans that allow all-you-can-listen access over mobile devices

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A look at 3 cloud music subscription plans

A look at some of the features offered by competing subscription plans that allow you to listen to songs of your choosing while connected to the Internet over cell phone networks:

— Rhapsody Premier

Price: $9.99 a month.

Tracks: 9.5 million.

Available: Now.

Devices: iPhone, Android phones. BlackBerry app coming soon.

Offline playback: Coming soon.

Trial period: Seven days.

Other features: Can create a randomized song list around a favorite artist or genre. Also works with home stereo systems made by Sonos, Logitech, Linksys and others.

— Thumbplay

Price: $9.99 a month

Tracks: 8 million.

Available: Now.

Devices: BlackBerry, Android phones. iPhone app coming soon.

Offline playback: Available now.

Trial period: Three days.

Other features: Can synchronize playlists with those in iTunes. Playlists made in iTunes update in real time on one’s mobile device.

— MOG All Access mobile

Price: $10 a month

Tracks: 7 million.

Available: Target release in May.

Devices: iPhone, Android phones.

Offline playback: Available at launch.

Trial period: Three days.

Other features: Using a slider control, users can generate a randomly selected playlist of songs from a single artist or gradually introduce more songs from similar artists.