One of the things I like when I go to festivals like this is to listen to their live band in a so-called fest tent or festival tent. I already love to listen to Bavarian folk songs. Maybe some of these musicians are using yamaha standard trumpet mouthpiece. I always see them perform on stage using trumpets, guitars, piano, drums and other kinds of music instruments.
I don't usually drink beer but I love going inside the beer tents to hear the beating of the drums and the music played by the live bands.
If you are visiting Germany take the chance to visit some of its festival to experience German culture. I have here an image from the Regensburg Dultfest during our visit last year.