Some critics argue that an opera' s stage directions are never reflected in its music  Many comic scenes in Mozart' s operas, however, open with violin phrases that sound like the squeaking of changing scenery  Clearly Mozart intended the music to echo the sounds occurring while stage directions are carried out
Hence, a change of scenery -- the most basic and frequent stage direction -- can be reflected in the music, which means that other operatic stage directions can be as well
a variety of stage directions can be reflected in an opera's music