How can I fix the extremely low volume issue on Apple Music for LG G3 TV?

I have just downloaded the Apple Music App on my LG G3 as I was curious to hear the Dolby Atmos tracks that I can't get on Spotify. The volume is EXTREMELY low compared with the same volume level for a Dolby Atmos movies or indeed switching to the Spotify app on the TV on the same song and is twice as loud. This indicates this is an issue with Apple Music. Is there are a way to troubleshoot this issue?

[Re-Titled by Moderator]