Is that final fantasy/zelda music? It sounds strangely familiar.
Nah, it's just that the app tends to produce similar music. You're not alone in thinking that though... most people think it's the Zelda music, haha. It's just a synth that's manipulated with your finger, and as it has a rather somber tone (at least with how Jordan is using it), it seems to sound a bit like Zelda.