Is there any apps to play music on iPhone 6s besides the default one?

I want to find another music app besides the one that comes with the phone to play music that I sync from my computer to my phone. Not one that I have to have an account with something like soundcloud

Probably isn't any for that sort of reason.

There are some but only if you're jailbroken.

But that's pretty much Apple. They pretty much want you to only use their apps and go to great lengths to make that happen.

There are a few, I used one once but to be honest, the default one is the best. What do you want that the default one does no offer? Why do't you try searching for music player on the App store.