Other companies that participated in the Twitter update include Blip.tv, Rdio, SlideShare, and DipDive.
There are players like Amazon.com (Nasdaq:AMZN), Apple (Nasdaq:AAPL), Pandora (NYSE:P), Grooveshark, SoundCloud, iHeartRadio and Rdio.
As part of the design launch, SoundHound also deepens its relationship with Rdio, the digital music service.
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Twitter's new app allows people to find music they like and tweet songs from iTunes, Spotify and Rdio.
Currently available in 24 countries, Rdio is funded by Janus Friis through his investment entities, Atomico, and Skype.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
If you want to just collect music and make playlists, Spotify and Rdio do that well enough already.
Besides third-party apps for Facebook, Gmail, Twitter and Groupon, Pokki has recently added music apps from Rdio and Grooveshark.
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Other apps you won't find on the platform include Instagram, Spotify, NPR, Remember the Milk, Flipboard, Nook and Rdio.
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Rdio is the ground-breaking digital music service that is reinventing the way people discover, listen to, and share music.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
With Spotify, Rdio, Pandora and Last.fm already doing that, what is going to set MySpace apart from the pack?
It's easy to upgrade to one of Rdio's flexible subscription plans for unlimited streams and access to Rdio's acclaimed mobile apps.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
Launched in August 2010, Rdio is headquartered in San Francisco and was founded by Janus Friis, one of the creators of Skype.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
Users can also try Rdio for free on a 14-day mobile trial.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
Rdio, Mog, Spotify, Pandora and other music streaming services are there, too.
Instead Facebook opened up the platform to companies like MOG and Rdio.
Sony Entertainment Group and Warner Music Group, though its catalogue on a macroscopic level seems undifferentiated from the likes of Rdio, for example.
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Without Jobs at the helm, Apple has continued to watch as services like Spotify and Rdio have gobbled up more and more listeners.
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By opening the social circle to seven new international markets, we're making Rdio an increasingly global way to play, discover, and share music.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
Also added were several subscription services: Rdio, Hulu Plus and Pandora.
Pandora now has over 125 million users, Songza is a top mobile app and a host of other options from Slacker to RDIO have attracted users.
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Streaming music services, including MOG, Rhapsody, Rdio, Spotify and Turntable.fm, can automatically send data to Facebook about each song a user listens to or about new playlists.
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Through a partnership with start-up Rdio, people can listen to a free 30 second clip of a song or listen to the full song if they are Rdio subscribers.
It's not the great music repository of an Rdio, but it'll give you those hard-to-find tracks that, for whatever reason, haven't made their way to more mainstream services.
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By extending the free web offer in this vibrant market, Rdio is looking to reward Brazil's passion for a quality music discovery experience and encourage new users to try the service.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
If HMV really wanted to compete long-term on the digital side, it would have to contend with the aforementioned companies as well as streaming giants like Spotify, Pandora, Rdio and iHeartRadio.
But arriving so late in the US means that the newcomer will find a market where digital music consumers already have plenty of choice, from Pandora to last.fm, from Rdio to Rhapsody.
In addition, Rdio has announced that the extended free web offer is now available to Brazil - currently the streaming service's third biggest market and its fastest growing territory in terms new users.
ENGADGET: Rdio on iPhone now shows which friends are listening, web streaming hits seven countries
An Apple-Facebook partnership would have inaugurated a terrifying digital music monopoly and no doubt crushed Spotify, Rdio, MOG, Clear Channel and the host of other streaming music start-ups now crowding the space.
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