explain: ntractual promise. [An appropriate issue statement followed by a clear, concise rule.] The facts state that Shelbyville had entered into a contract with Tunes Aplenty. Shelbyville then notified Tunes Aplenty that their services would not be required. This would be a breach of the contract Shelbyville formed with Tunes Aplenty. Shelbyville may attempt to argue that their duty to continue with the contract was discharged because of the destruction of the tree. However, the destruction of the tree did not make it impossible to hold the concert, nor would it impose a severe hardship on Shelbyville to hold the concert. Lastly, the concert was a "holiday" concert, and the loss of the tree would therefore not frustrate the purpose behind the concert since it could still be held to celebrate the holiday