This happens to me all the time! I'll be in the car with my wife and a song I really like will come up, and the section hits and I'll say "Goosebumps!" and show her my arm. She also did not believe me until I physically showed her.

They are often songs that are attached to important emotional events in my life, sure, but there are also songs that come out of nowhere and still give me goosebumps. Some things are just that moving!

Same for me; the frisson at particular passages of a song or piece is almost completely predictable. There might be a few dozen such passages for me; I haven't really thought about it.

There are also certain frequencies you can use to instill fear in people subconsciously.