Can I change the default music player app on my iPhone? If so, how?

Question

I want to change the default music app on my iPhone from Music to Spotify. Is this possible? My first guess is that I would have to jailbreak my phone. Is there anyway to do it without jailbreaking?

Answer 1

I would say there isn't really any default music player on the iPhone. You could say that Apple's Music-app is the one that opens when you press "Play" on the lock-screen or the "multitasking bar", but there's no real advantage in that.

To answer your question, no. You are pretty much unable to change any default things in the non-jailbroken version of iOS.

With that said, you can do some tweaks having jailbroken your device. If you would like to use Siri to play your Spotify music, there is a jailbreak app for that called AssistantLove.
Other than that, you could use the jailbreak app SpotiPlay. It makes the Spotify-application the one used on the multitasking bar.

Answer 2

There is no way to do this on a non-jailbroken iPhone. And even after jailbreaking, there is currently no tweak which lets you do this.