The app is basically a skin for the iPod app, however the ui will be completely bespoke and non-standard.
- instant search feature
- custom keyboard
- drag & drop songs into a queue (including re-arranging)
- many gesture controls (using standard gestures, e.g. double-tap, 2-finger tap, swipe left, etc)
- in-app purchase to remove ads
i have mock-ups already drawn up, and a good idea of how app will look & work.
i don't think this is a particularly technical or complicated app; the most important thing is a beautiful, polished ui.