(( At 1:15 their drums ended but you can listen to the rest I can't stop you XD))

Demon eaters are rare to find so when you step into thier lands they play drums

They play them at battles for the thrown

Or when danger is near

And also when they are getting ready to hunt and destroy a realms population

And on special events

The drums get faster if your getting to close to something important by that time the drums will stop and the whole realm will be perpared to harm you

((Fun fact they play the drums with sticks or their tails and hind feet))