Does the Artist Share in the Revenue?

Google is in the news again, this time involving a month long test of it’s video advertising system. It has Warner Music and Sony BMG as partners in this test. They will share in advertising revenue generated through AdSense, which will pay every time an impression is generated when their music videos are viewed. I’ve been reading a lot about this and there seems to be no mention of what happens to the money the record labels receive. Is that money shared with those artists whose videos are being viewed? I’m guessing that since this is a new model, these provisions were not written into artists’ contracts. As an artist manager, I want to know that my client is receiving his/her fair share of profits generated by their art. I will continue to look into this.