Is there an app to edit music?

Such as making the songs instrumental, and making remixes? I have an iPhone. Is there any for iPhone.

Djay, it's not professional though its very good

I don't think there are any apps that can create instrumentals from regular songs. It can be done, just not with an app on an iPhone. You can create music with the Reactable app or FL Studio Mobile, but as far as remixing songs go, you'd be better off using an actual computer.