How to stream audio not stored on device to DLNA devices without rooting?

[Domology]

Recently switched back to Android after my iPhone contract expired. I've been used to streaming any audio at all across DLNA to my stereo via Apple's built in AirPlay that my stereo (Marantz M-CR610) is compatible with.

I'm looking for any way that this can be achieved with my Sony Xperia Z5 Compact (running Lollipop 5.1.1) without having to root my phone. My stereo can access media servers via DLNA as well so I am not restricted to just using AirPlay.

The main uses I have are the following:
Stream live/on demand internet radio
Stream audio of YouTube videos
Control playback of media stored on my Synology NAS to my stereo without having to be played through the phone

 

[FriendlyPear]

I use BubbleUPNP to stream from NAS.

YouTube app had stream to DLNA Client built in.

I am not sure about radio apps (I mostly use chromecast and bluetooth)