The drumming is good advice, although some people can't hear it well.

I am one of those. Too many years of dove shoots and .22 squirrel hunts have damaged certain levels of my hearing. Drumming falls into one of those. I have heard drumming one time, and it was on youtube. I had to turn the volume up real high to hear it. My buddy was sitting there going, "You can't hear that!". Until I turned it way up I couldn't.