Need help

I can tell this is a very good app to use but I cannot access any songs. I have an IPhone 6s, I dont know if this is the right app for this device because I cannot add any songs from Apple Music because they are all copyrighted and cannot be used. For Spotify I havent used yet because you have to pay for premium which I wont do since its $12. Please help me find the solution for this problem or the right app to use for iPhone 6s

Lucifam about djay 2 for iPhone, v2.8.6