I'm not surprised you feel uncomfortable about this proposal. You have to question the ethics of a company that makes their interview candidates do for free a substantial amount of the homework that the company would otherwise have to pay consultants to do. Added to which, they are proposing to charge their artists a not inconsiderable amount per month for promotional work that labels are supposed to do anyway out of their cut from CD sales and concert fees. The box office percentage is just ridiculous - I think the MU would take a very dim view of that clause.
I would not want to put you off this employment opportunity, but I would tread carefully.