Study each of the following case. Answer the questions that follow with Yes or No.

Rodrigos, the leader of a rock-and-roll group, agreed to provide music for the annual Park College Marketing Club dinner dance. On the night of the dinner dance, however, another, very amateurish group showed up and said that Rodrigos had assigned the contract to them and that they would play the engagement.
a. Is a person who hires an outside entertainer required to accept the services of a substitute if it is impossible for the original party to perform?
b. Are all contracts assignable?
c. Can contracts for personal services be assigned?