Mario, a Professional Entertainer, Entered into a One-Year Contract with Barnum

True/False

Mario, a professional entertainer, entered into a one-year contract with Barnum to perform exclusively at Barnum's theatre, and to perform nowhere else during that period of time. A week after the agreement was signed, Mario entered into another agreement with a competitor of Barnum to perform at his opera house. The court may order Mario to continue to perform at Barnum's theatre, because he had promised to work only for him.