Medical eye clinic corporation enters into a contract with local musician

Natalie who agrees to perform for a meeting of Medical Eye's personnel to be held in its main office building. Before the date of the meeting Natalie refuses to perform citing a higher paying gig. Meanwhile Medical eye contracts to sell the building to Optical Center,Inc., but before yhe transaction is complete Perfect Vision Company offers to pay a higher price. Medical Eye refuses to transfer the building to Optical Center. In separate suits by Medical Eye against Natalie and by Optical Center against Medical Eye, each plaintiff seeks specific performance. How might the court rule in each case and why?