Google has done a very cool thing in my opinion: when a label recognizes a track, it can have the choice of either blocking it, or just getting all the ad-related income be sent to them instead of the uploader.
This is a very good solution, everybody wins.
Myself, I try to be as "authors friendly" as possible, by crediting the music, and giving a link to other youtube videos of the group. I never had a music track disabled anymore, but had seen sometime the ad revenue sent to them (Note: I dont use ads myself).
For instance the music copyright holders of my uploaded video at
claimed their royalties this way. They even add a link for viewers to purchase it on itunes.
Or you can just add a music directly from Google catalog (the music note icon), like in
If the copyright holder are too dumb to take advantage of this opportunity to make money, just go to vimeo...