Well it would help me if I knew what song, but you don't have to if you don't want, that's fine. Don't wanna trigger anything.

Sometimes I've noticed after listening to music more closely through the years. Certain ways music is played (like a certain melody) can really just sound THAT great to the ear that it instantly triggers something. I noticed it more with video game music lately as well (a lot of tracks may remind me of pieces from an emotional scene or something) and it may trigger my eyes to get a bit watery.

Maybe it sounds similar to something you've heard in the past that has a mental key on that. Where it sounds similar, or the word play for the song, that may remind you of something (whether you know what "that" is or not). Sometimes it's all in your mind and it's hard to tell exactly what it may be causing it