Hi,
I was working with audios services for my own project(see my portfolio)
and I have a few simple ideas to make it better - for example - to add a timer,
because a lot of people(as me) listen music to fall assleep)
Also I have a good expirience with ios distribution and can help you with later support.
About my skills:
3+ as iOS developer
CoreData, Geolocation, Social Networks Integration, complex UI building with Storyboard and XIBs, AFNetworking, PassKit, Autolayout, Google and Flurry Analitycs, In-App Purchases, Localization, Testflight. XML Parsing, Distribution, TouchID et cetera.
Have a good choice!