Handel, aged 13, is a violin virtuoso. He has signed a four-year contract with Bach to learn specific violin techniques to improve his skills. The terms of the contract stated that: a. Bach would teach Handel violin free of charge; b. During the four-year period, Handel could not accept performance engagements for the violin other than those under Bach; and c. Bach would employ Handel to perform on stage for at least two paid performances per year. Handel accepted a performance engagement from Mozart, to highlight his skills on the piano, as his income from Bach's employment was insufficient for his support. Bach wishes to sue Handel for breach of contract. Required: Advise Bach using the principles of contract law.