When two Star Wars fans made the spontaneous decision to play the main title theme in front of John Williams's house, they found the composer they were looking for. Williams was surprisingly chill about being bombarded by nerds with horns.

The kind composer greeted the musicians outside and was nice enough to shake their hands, rather than do what any other person in this situation would have done.

Well, basically any old man.
Well, basically any old man.

See that, kids, if you want to meet your favorite celebrity, show up to their house! What could go wrong? It works for Aaron Paul, so it can only end well in any situation.