Unwanted music on Fire TV

Hi, brand new user here.
I got Kodi for my Fire TV stick and it’s great but I get an issue when opening any video or music. After I hit Play, the content loads. Then it pauses itself after about 2 seconds, and some music starts playing. Then if I press play again, the music stops and the content plays as normal. Sometimes if I press pause during playing something, the same music plays.
How do I stop it automatically pausing itself after hitting play?
And how do I turn off what appears to be a background music function? Or how do I control/change what music it chooses to play? The music it currently plays isn’t even stuff I like!
TIA