Service discovery is not an easy task in today's Web. Discovering an API requires searching through a large number of services on the Internet and then reading pages of documentation to figure out how to use the ones that may match your application. This is the case in Programmable Web as well. The API directory shows over 5000 APIs which are manually categorized in over 50 service categories.
Decibel pitches itself as a leader in the music metadata space by citing a deeper and more accurate dataset than its competitors. The slick video (embedded below) on its site is quite convincing. Decibel claims to collect music metadata from all sources all over the world, including record labels and users, check it for accuracy, and compile it into the database. It’s ambitions are set high with the goal of creating an industry standard in music metadata, and why not? Someone’s got to do it!