Hello, I've been using an app called skifta to stream music from my phone to the xbox one. But there's a problem, you can only stream purchased songs as it is licensed. Most of my music on my phone are mixtapes which are free therefore not licensed so I cannot play them.
On the xbox 360 I never had this problem as it allowed me to play all the songs on my phone.
I suggest that on the xbox one you should be able to play all music, just like you could on the xbox 360