Rdio was an online music streaming service that offered ad-supported free streaming and ad-free subscription streaming services in 85 countries.  It was available as a website and via app for Android, BlackBerry, iOS, and Windows Phone mobile devices, which could stream music from Rdio's servers or download music for offline playback;  there were also clients for the Roku and Sonos systems. The web-based service also offered a native desktop client application for OS X and Windows, as well as a Windows Store application. 
Rdio's library had content from the four major record labels, as well as the Merlin Network and the aggregators BFM Digital, Catapult, CD Baby, Finetunes, INgrooves, and The Orchard.  Rdio also offered social networking features, such as the ability to share songs, albums, and playlists with others on Rdio and social networks such as Facebook and Twitter.
On November 16, 2015, Rdio filed for chapter 11 bankruptcy in which they had to pay $200 million and announced the sale of certain intellectual property to Pandora Radio. The purchase price is $75 million in cash. 
Rdio was launched by Skype founders Niklas Zennström and Janus Friis on August 3, 2010. At the time they had to compete with services such as Deezer, MOG, Napster, Rhapsody, and Spotify. On September 27, 2013, Rdio added a music recommendations feature that delivered personalized albums, stations, and playlists.  On January 16, 2014 Rdio introduced some free streaming options, supported by audio advertisements. 
On November 16, 2015, Rdio filed for Chapter 11 bankruptcy, and reached a deal to sell certain assets and intellectual property to a competitor, Pandora, for $75 million, pending approval by the bankruptcy court. As part of this transition, the Rdio service was discontinued effective December 22, 2015, and some employees were transferred to Pandora, which will introduce an "expanded" experience incorporating this IP in late-2016. 
On April 2, 2013 Rdio launched Vdio, a movie and television show streaming service. Vdio was set up similarly to Rdio but adopted a pay-per-view model. The service focused on newly released titles from major Hollywood studios like Disney, Fox, Universal Studios, and Warner Bros. 
Current Rdio subscribers were given US$25 in credit to spend on Vdio. 
Vdio was shut down on December 27, 2013. 
In 2013, Entertainment Weekly compared a number of music services and judged Rdio the best, grading it "A" and writing that it had "by far the best app and online interface, making database searching and playlist curation easy". 
Cumulus Media - On September 16, 2013, Cumulus Media announced a deal with Rdio that gave the second largest owner and operator of AM and FM radio stations in the United States an online outlet. This partnership gave Rdio broad access to its programming and promoted Rdio on Cumulus stations. 
Jaguar Land Rover - In January 2015, Rdio announced a partnership with Jaguar Land Rover, a luxury brand car manufacturer.  The application went live on Jaguar LandRover's InControlApps Platform on July 3, 2015.
On June 30, 2014, Rdio acquired the social music discovery service TastemakerX.  The entire TastemakerX team joined Rdio with TastemakerX CEO Marc Ruxin becoming the new COO.
Launched in 2011, Rdio’s API allowed developers to add music to a web or mobile application with the ability to search, access, and play all of the artists, songs, albums, playlists, and charts in Rdio’s catalog.