True. My misreading. I was thinking of what the boyfriend's friend was saying and thinking it was his advice, not his experience. Sorry Sophie.
That being the case the answer to many parts of your question come down to what is agreed in the contract. If it is covered then the terms of the contract should most likely be fulfilled, if not then it is an ammendment or supplimentary term that needs to be negotiated unless it is a stipulated option whose terms are pre-agreed if yet not enacted.
If not yet agreed between your boyfriend and the label:
1. most likely the label
2. not if the label controls the page
3. I believe income comes from a share of advertising income
4. generally the label would be supposed to pass any income on to publisher and artist according to a share split governed by a contract betwen the parties involved. In this Vevo is quite right that it is outside their contract assuming they have no provision for spilitting payments between publisher and label. Both labels and publishers commonly collect monies from income streams which they then distribute to artists and songwriters. In this labels and publishers are suppoaed to provide accounting details covering money collected and then distributed according to the share split dictated by their contract.
5. Yes, usually there is. Contracts often stipulate what can go to arbitration and how an arbitrator can be selected.
6. Unlikely as the content you mention is controlled by the previous label, although a deal could be done between the labels. Generally it is the labels that own the videos. I doubt that could legally happen without express agreement.
7. contract law. it depends on what has already been agreed and I doubt the artist expressly gives their permission. The label would assert it has that right (rightly or wrongly) in otherwords asserting that they have the right as dictated by a contract outwith the vevo contract, ie your record contract.
8. a ) control b ) if they trust the label to honestly administer rights then they gain the same thing they gain with and trading of rights.. ie someone else does the work.
9. no idea. I doubt it.
Sorry I can't be more helpful. I am not a lawyer nevermind an entertainments lawyer. Vevo have obviously aimed to divide and conquer, dealing with as few parties as possible and trying to push any compliance details onto the labels alone.
One additional point to make is that if this is up for negotiating just now you should ask the label to explain the business justification for them administering the page and exactly what rights they need and what they will do in terms of accounting. Your boyfriend needs to have a healthy working relationship with them at the end of the day and a certain degree of trust will be needed. No matterr what is agreed however please get it checked by an ents lawyer.