You might want to give roon or audirvana a try. Better sound than AppleTV 4K driving KEF LS50Ws?.Basically I have my own home server with music on, and then I can use the Roon ARC app to access it on the go, similar to above (and is similar to PlexAmp mentioned elsewhere here). I also use Roon, which is a little complicated to describe here. What do you guys use to play music on the go?