Decibel launched its first API in 2011. Since the launch, Decibel has enjoyed success in becoming the fastest growing European company in the digital music sector. However, the massive growth falls short of Decibel's ultimate goal. Decibel hopes to enhance the consumer relationship with digital music and uncover the next generation in digital music services. In the end, Decibel aims "to become the industry standard for music metadata."
Vadio is building a business off the YouTube API. The company also has its own technology for translating a list of songs into music video playlists no matter where the videos are stored. Vadio has already seen interest from radio stations, because the product is more appealing than simple audio and increases listener engagement.
ProgrammableWeb lists many popular Music APIs in the directory including Last.fm, 7digital and Spotify Metadata. This post features a few really creative, entertaining mashups that use a few popular Music APIs.