Social music-streaming service Rdio announced today it has raised $17.5 million as it expands to new platforms and regions.

Created last year by the founders of Skype, Joost and Kazaa &8212' Janus Friis, Niklas Zennstr¶m (pictured) &8212' Rdio hopes to blend social networking, internet radio, and music playback. If it succeeds, music-streaming services like Rdio (pronounced R-D-O) could shake up the music business, ending the buying of songs and albums individually in favor of subscriptions to a big library, much like Netflix has done with movies.

The idea is to give users a seamless music experience, so they can listen to music on a computer, pause it, and pick up where they left off on a phone or other device. Users can see what their friends are listening to and exchange play lists. Radio-type sites such as Pandora or Last.fm play song genres you like but dona4‚¬a4„t let you choose specific songs or a specific play order. But on Rdio, you can listen to whole albums without interruption. The service launched last August.

The latest deal was led by Mangrove Capital Partners and included existing investors. Friis and Zennstr¶m originally funded the company through their technology investment group Atomico. The company has deals with major music labels, including Sony Music Entertainment, EMI Music and Warner Music Group. Subscribers to the service get unlimited access to its millions of songs for $4.99 on the desktop and $9.99 for the mobile service.

The company is based in San Francisco. Rivals will eventually include Apple, which bought the streaming music service Lala, and potentially Spotify. Other rivals are Rhapsody and Microsoft Zune. For now, Apple uses the individual song or album downloading model, where you pay for a song and download it to a computer, and requires that you manually manage take the music to other devices you want to listen to it on.

Kazaa, as well as Napster, helped bring down the traditional industry of music CDs.

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Tags: streaming music

Companies: Apple, lala, last.fm, Pandora, Rdio, spotify

People: Janus Friis, Niklas Zennstrom

Tags: streaming music

Companies: Apple, lala, last.fm, Pandora, Rdio, spotify

People: Janus Friis, Niklas Zennstrom

Dean is lead writer for GamesBeat at VentureBeat. He covers video games, security, chips and a variety of other subjects. Dean previously worked at the San Jose Mercury News, the Wall Street Journal, the Red Herring, the Los Angeles Times, the Orange County Register and the Dallas Times Herald. He is the author of two books, Opening the Xbox and the Xbox 360 Uncloaked. Follow him on Twitter at @deantak, and follow VentureBeat on Twitter at @venturebeat.

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