Answer: the court should allow the art collector to testify regarding just the oral agreement for the frame.
Explanation:
Contractual terms that are set forth in a writing intended as a final expression of the parties' agreement cannot be refuted by evidence of any prior agreement or contemporaneous oral agreement. Although this parol evidence rule prohibits contradicting the writing, the terms of the writing may be explained or supplemented by cocurrent additional terms, unless the court finds from all the circumstances that the writing was intended as a complete and exclusive statement of the parties' agreement. To determine whether the parties intended the writing to be the complete and exclusive statement of their agreement, it must be determined whether parties situated as were the parties to this contract would naturally and normally include the extrinsic matter in the writing. Here, the writing at issue states clearly that the painting subject to sale is any painting by Alpha. The art collector's assertion of a prior agreement allowing him to buy a painting by Beta clearly contradicts the terms of the writing. Therefore, the parol evidence rule will render inadmissible testimony as to such an alleged agreement.