I don't know anything about jazz or how to create any kind of music, but it's so relaxing to type while listening to these notes. I would love this as an application integrated with the OS, so I can listen it with every keystroke.
This idea is on my list for quite some time. It's simple and fun. I really don't know why I waited so long to build it.
I'm also planning to add some competitive features, like a leaderboard. But I liked your idea. A duel mode between two or more players sounds really fun!
And I agree it works really well with movies, but it's on the roadmap to expand to tv shows, games, books, bands, songs...
The skip button should take you to another random emoji. And maybe it did, but it was the same random emoji as before. I should probably add some code to don't let this happen.