Pistol Pete offers to buy Tommy Two-Tone's guitar. Pistol is interested in the red guitar that was used in Tommy's last concert. He sends a letter with a signature line for acceptance saying that he wants to buy the guitar that "Tommy used in his last concert." The quoted price is $5000. Tommy is interested in selling his blue guitar and signs on the acceptance line of the correspondence sent to him.He then arranges for delivery of the blue guitar that he also used in his last concert.Upon receiving the blue guitar, Pistol refuses delivery and also refuses to send the money.He points out that he had spoke to Tommy on the phone prior to sending the correspondence and talked about all the songs he played at the concert.Tommy counter complains that it was understood that he would only sell his blue guitar and indicated in another email that was sent to Pistol's office on another day as proof.What legal issues are present?