Rdio is an ad-free music subscription service available in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 and Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

. It is available as a website and also has clients for the iPhone

IPhone

The iPhone is a line of Internet and multimedia-enabled smartphones marketed by Apple Inc. The first iPhone was unveiled by Steve Jobs, then CEO of Apple, on January 9, 2007, and released on June 29, 2007...

, iPod Touch

IPod Touch

The iPod Touch is a portable media player, personal digital assistant, handheld game console, and Wi-Fi mobile device designed and marketed by Apple Inc. The iPod Touch adds the multi-touch graphical user interface to the iPod line...

 & iPad, Android, BlackBerry

BlackBerry

BlackBerry is a line of mobile email and smartphone devices developed and designed by Canadian company Research In Motion since 1999.BlackBerry devices are smartphones, designed to function as personal digital assistants, portable media players, internet browsers, gaming devices, and much more...

 and Windows Phone

Windows Phone

Windows Phone is a mobile operating system developed by Microsoft, and is the successor to its Windows Mobile platform, although incompatible with it. Unlike its predecessor, it is primarily aimed at the consumer market rather than the enterprise market...

 mobile devices, which can play streaming music or cache songs for offline playback. There are also clients for the Roku

Roku

Roku , is an American, privately held, consumer electronics company that sells home digital media products. The Company is based in Saratoga, California.- Company profile and products :...

 and Sonos

Sonos

Sonos is a consumer electronics company based in Santa Barbara, California. It was founded in 2002 by John MacFarlane, who previously founded Software.com. The company’s main product is the Sonos Multi-Room Music System.-History:...

 systems. The web-based service also offers a native desktop client app for Mac OS X

Mac OS X

Mac OS X is a series of Unix-based operating systems and graphical user interfaces developed, marketed, and sold by Apple Inc. Since 2002, has been included with all new Macintosh computer systems...

 and Windows

Microsoft Windows

Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

. Its library has content from the four major record labels, as well as the Merlin Network

Merlin Network

Merlin Network, or just Merlin, is a non-profit organization charged with "representing independent music companies in enhancing the commercial exploitation of their copyrights on a global basis." Merlin's mission is "to represent the world's independent music sector and act as an efficient central...

 and the aggregators IODA, INgrooves

INgrooves

Ingrooves is a San Francisco-based, global digital distribution and music licensing company that provides various distribution, marketing, publishing and administrative services for selected independent record labels and recording artists, film and video companies, print media publishers and...

, The Orchard, IRIS Distribution

Iris Distribution

-IRIS Distribution:IRIS Distribution is a digital music distribution and marketing firm based in San Francisco, CA and New York City. Co-founded by Matt Laszuk and Bryn Boughton in 2003, IRIS distributes digital music, ringtones, and video to over 450 digital retailers in over 85 countries...

, and Finetunes. Rdio also offers social networking, allowing users to share playlists and follow others to see what music they listen to.

Rdio was created by Skype

Skype

Skype is a software application that allows users to make voice and video calls and chat over the Internet. Calls to other users within the Skype service are free, while calls to both traditional landline telephones and mobile phones can be made for a fee using a debit-based user account system...

 founders Niklas Zennström

Niklas Zennström

Niklas Zennström is an entrepreneur best known for founding several high-profile online ventures with Janus Friis including Skype and Kazaa. More recently he founded the investment group Atomico and has become a significant figurehead for entrepreneurs in the tech sector.-Career:Zennström started...

 and Janus Friis

Janus Friis

Janus Friis is a Danish entrepreneur best known for co-founding the file-sharing application KaZaA, and the peer-to-peer telephony application Skype. In September 2005, he and his partner Niklas Zennström sold Skype to eBay for $2.6B...

  and left private beta testing on August 3, 2010. The founders were also behind music service Kazaa

Kazaa

Kazaa Media Desktop started as a peer-to-peer file sharing application using the FastTrack protocol licensed by Joltid Ltd. and operated as Kazaa by Sharman Networks...

.