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First of all I have never created an app in my life so I'm a complete newbie!

I have a customer that wants an app created that will stream cambodian music for restaurants and hotels. Commercial free.
He has all the music already that can be uploaded to a server.
He would also like to have an image included with the app.
The app should work on a PC, notebook, tablet or cell phone.

I will also be creating a website for him for a totally different purpose, so he will have a hostgator account if that is of any benefit.

Can anyone tell me the easiest (and cheapest) way to create such an app, whether it be software based or an online app creation website?

Any suggestions are welcome and much appreciated.

Thanks
Marketeer