If you’ve ever been to the tents in Munich, you know that by nightfall, the polka has largely given way to some good-ol’-fashioned Rock & Roll. So on our last Saturday night of Oktoberfest, DJ Lederhosen, a mysterious, lederhosen-wearing, lager-guzzling, German will show up with two turntables and a bunch of classic (and newer) rock to take Oktoberfest to eleven.