Throughout life, but perhaps most profoundly in our youth, we encounter things or people that click on a cellular level—a movie; a book; a group of friends that awakens, challenges or reflects our feelings or worldview in ways that help define our identity. For me, it was a radio station.

It’s pretty common in music circles to encounter people who have spent literally decades trying to identify an obscure song on an old mixtape. Here’s one method that might help.