What is a good music app for iPhone 5 that lets you play music without Wi-Fi or data?

I have an iPhone 5th generation that is not connected to a services (I use it as an iPod) I have Spotify and soundcloud but I can only use them with Wi-Fi connection. I want a music app that I can use on my iPhone when I'm not in Wi-Fi range (on the bus, camping, road trips, school, hospital visits and so on.) Please help.

Music app

Buy the music, sync it over with iTunes and use the default app. Or rip it off CD's you own and do the same. If you get the music from other means, like "free" methods, the same applies. Or simply subscribe to Apple Music or Spotify Premium and you'll be able to save the music for offline listening while you remain subscribed.

A music app that would allow you to save music for offline use without paying or listening to ads would be piracy and so those apps get deleted by Apple from their AppStore. The ads on spotify go for their revenue and to the music companies for their licenses.