Hi, sir.
I have read your requirement carefully
I am a Android and iPhone/iPad developer and your project is very interesting for me especially music app.
My ability is just suitable for your job.
I'm guru of moblie app development and I have enough experience using several framework such as GPS, Google API, Urban Airship, Push Notification, Web service and so on.
Of course, I know you could be in doubt about my real ability.
It would be important for me to prove my ability through real project.
I hope this project would be the first step in long term partnership with you.
I await your favorable reply with interest.
I feel confident my execution of this order will be to your complete satisfaction.
Best Regards.
xian