Music licensing company Rumblefish has just made it easier for professional and amateur content creators to add music to their work legally by opening its API to developers and partners.

Rumblefish announced Tuesday that it has licensed 4 million songs in user-generated videos, slideshows, presentations and games.

Now, for example, an app that allows users to make home movies and post them to social networks can also give folks the option to license music for the videos for a fee. Users can browse playlists, receive soundtrack recommendations and search for and filter music via attributes (mood, instrument, tempo, etc.).

API partners will qualify for a share of the revenue garnered from licensing as well, but Rumblefish could not provide us with an exact percentage partners will earn. It will depend on the product.

The company launched a similar service called Friendly Music last year to facilitate finding licensed music for YouTube videos.

Rumblefish already made its API available to a select group of partners at the beginning of 2011, including social moviemaking app HighlightCam, fitness provider Journey Gym and online video editing service Clipik. Now, all interested parties can apply to access the API — for free.

The announcement comes on the heels of similar news from licensing company, Audiosocket, which released its Music As A Service product earlier this month.

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Boutique music licensing agency Audiosocket is launching a new service that will make it easier for content creators to get access to music legally.

Audiosocket has just unveiled Music as a Service, a platform that can be plugged into third-party photo- and video-sharing services, gaming platforms, digital and ad agencies, and social networks. Users of those services can access the agency’s catalog of more than 33,000 songs for use in their projects.

Audiosocket tells us that it has signed “several major partnerships” with companies planning to use Music as a Service, but declined to reveal any specifics. However, we do know that Audiosocket’s API is open and available to developers (via its website), so any platform that wants to integrate Music as a Service can do so (after being approved by Audiosocket). Partners stand to gain 10% to 50% of revenues generated via music licenses, depending on scale.

We can see this platform being a boon to content creators on bigger platforms — much like YouTube integrating Creative Commons video into its video editor. We can also see it gaining more revenue and recognition for artists across platforms, as their music will be easily available to a wider variety of customers.

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