Given the task definition and input, reply with output. In this task, you're given a pair of sentences, sentence 1 and sentence 2, that contradict each other. Your job is to alter sentence 2 so that the pair agree with each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.

Sentence 1: A older mustached gentleman with glasses and a hat strums an electric guitar in front of a blue microphone. Sentence 2: A older mustached gentleman with glasses and a hat strums an electric upright bass in front of a microphone.

An older man strums his electric guitar.