A bulletin board I've used is a big
picture of a conductor with the slogan "Conduct Yourself Accordingly"
and then post the classroom rules.
Variations: Maybe you could put the rules on silhouettes of the different
instruments of the orchestra or on the choir folders of a choir that is being
conducted. If you're really gutsy why not print out a conductor with your face
Another Variation: Post rules for concert etiquette instead of