Die Meistersinger von Nürnberg
One of the Mastersingers is the town clerk.  His name is Beckmesser.  He is a comic figure and Wagner makes him look very silly.  Beckmesser is the “marker”.  This means something like: an “adjudicator”.  When a singer makes a “mistake” (disobeys the rules) the marker puts a chalkmark on the board.  When Walther sings his song Beckmesser makes lots of chalkmarks.  Hans Sachs is the only person who realizes the beauty of his song.  There is a lot of shouting and Walther has to stand on a chair to finish his song.