Have you ever wondered why you can listen to a melody you’ve never heard before and it just makes sense?

Think about it. Every new melody supposedly starts from scratch—a brand-new sequence of notes nobody has ever heard before. And yet something in your brain follows it so fluently that you can tell instantly when a performer hits a wrong note. You don’t need a music degree. Bah! You just know.

Which raises an interesting question: how do you just know? How do you know the performer made a mistake rather than the composer deliberately writing in that big surprise honker as part of their genius musical statement?

Could it be that melody has a vocabulary? That composers and improvisers don’t assemble tunes one note at a time—any more than a tailor builds a garment one thread at a time, or a novelist writes one letter at a time?

Preposterous, right? How could melody have a vocabulary nobody has ever heard of? It’s not like Bach, Beethoven, and Bad Bunny were living off-grid in some remote tribe, beyond the reach of anyone curious enough to write it down.

And yet.

Once we listen closely enough; once we ask why melody just “makes sense;” once we start finding identical patterns from one melody to another (like “Twinkle, Twinkle Little Star” and “What a Wonderful World,” for instance), the idea of a melodic vocabulary seems less crazy. After all, How else can we explain why we hear the same melodic figures appearing again and again, across centuries, genres, and styles?

And here they are, laid out in a table. Click on any figure to test what I just said—that these figures appear across centuries, genres, and styles.