input: [Capability usage] The musicLibrary capability provides programmatic access to the user's Music, allowing the app to enumerate and access all files in the library without user interaction. This capability is typically used in jukebox apps that make use of the entire Music library. The file picker provides a robust UI mechanism that lets users open files for use with an app. Declare the musicLibrary capability only when the scenarios for your app require programmatic access and can't be realized by using the file picker. For an example of how to access files in a library, see Quickstart: Accessing files programmatically. [Capability scenario] 
output: Music