I beg to disagree. NO way offending you or the dev. of the app. It looks splendid from the screenshots seen here, but something as basic as playing music from my phone, IS MY RIGHT and should be FREE. The dev. has put in effort, hard work, time, money, patience. I completely agree. I appreciate it. But the purpose should be to provide people with an alternative, NOT to make money.
It should happen out of love of the community and the pride you will feel when everyone will have your app. It's too basic an app to get charged for IMHO.. Again, dev. - I love the look and feel, don't get me wrong. I sincerely appreciate your hard work. But this is my opinion.