How should YouTube - Google Music - G All Access integration work? Given that YouTube is now one of the foremost ways of consuming music and especially very new, preview and obscure musics.

This question was prompted by Last.FM integrating videos from Muzu into their system. 
http://thenextweb.com/insider/2013/05/21/last-fm-joins-forces-with-muzu-tv-to-bring-90000-music-videos-to-its-internet-radio-service/