With the regular LG media player app, a screen saver cuts in after a few minutes of listening to music.I love my LG OLED TV but what about "burn-in" problems because of the static logo and layout of the app ?
Or, you can always turn the screen off while you’re listening to music - it’s just a pity that the “screen off” option is in the bottom of a locked filing cabinet in a disused lavatory with a sign on the door saying “beware of the leopard”. (Actually, Settings - OLED care - Device self-care - Energy Saving - Screen Off, but near enough...)
Better solution would be to get a sound bar/AV amp with Airplay and cut the TV (and it’s not very good speakers) out of the loop... my sound system is a bit pre-airplay, though