By revealing his ignorant assumptions
Music is an art form that appears in every culture. For thousands of years, it's been an important part of the human experience. Music has been use as entertainment, as a way to pass on stories, and as a form of artistic expression. People may have there own preferences in the type of music they like. Most people will like music in some form. Music has even been used by therapists to help patients with mental and physical health issues. But do you think they have achieved good results?
The trustworthiness of a speaker adds to the speaker's "appeal to reasoning" although it should be noted that it also contributes to the speaker's reputation.