What is YouTube Music Key?

YouTube Music Key allows watching and listening to music videos.

The service offers ad-free, audio-only playback for background listening in addition to video viewing, as well as offline listening.

When you deliver an album to this channel, it will be made available and monetized in the YouTube Music Key service.

It will also include a subscription to Google Play Music, with 30+ million songs, expert-curated playlists, and in the coming days, the ability to watch many YouTube official music videos right from the app.

More information on YouTube Music Key here: 

http://youtube-global.blogspot.com.es/2014/11/youtube-music-2014.html