I want a list of Music Content Providers and Music Content Editor that
can give local music editing service to restaurants and pubs in
London.

The content provider is identified by the ability to meet with
clients, edit playlists (like D.Js or Music Editors) and supply legal
digital music content (e.g mp3 or wma format)

It can be also names of D.Js that works with actual restaurants and
bars/pubs in London. They must all have the ability of meeting with
the clients and providing an up to date content

I need names of at least 7 different providers.

Check out www.magnatune.com the owner, John is in London at the moment.