Find, Mix and Watch. That is the slogan of Youtube’s newest addition Youtube Disco. The new feature is basically a music exploration service. It begins by entering an artist, band or song in the search form on the start page. Youtube will then crawl its vast database and display a results page that consists of a music playlist of songs by that artist, related artists, artist information (if available) as well as two additional playlists.
The first playlist mixes the original artist with related artists while the second displays only related artists and their songs.
Songs from all three playlists can be mixed together and viewed on the same page.

Youtube Disco can obviously be used to either play only songs from one artist or songs from that artist and related artists. The latter seems to be the main use of the service as the other option is also possible directly on Youtube.
The music videos that are selected in the playlists are not necessarily high quality videos as they can also contain live or fan made videos.
The music discovery service is without doubt one of the core features of Youtube Disco. It is easy to use and seems to yield good results most of the time.
Youtube Disco is an official Youtube service
Update: YouTube Disco is still available on the video portal, but not linked from the main page. The main site links to popular artists that you can click on, and offers a search form to find specific artists or songs.
Depending on where you are connecting to Youtube from, you may not be able to access all of the videos suggested to you. You can also play the top 100 list right away with a click on the top 100 link.
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Ever seen: http://www.tubedisco.com ?