I'm confident that the best answer is "positive reinforcement"
Explanation:
I believe this scenario is an example of positive reinforcement because hearing your favorite song is something which gives off a positive vibe. And to reinforce something means to strengthen something such as an activity or action, in my own words.
MLA in-text citation style uses the author's last name and the page number. If the source doesn't include a page number then only use the last name of the author.
