Here are the possible solutions for emile berliner's 1877 good idea clue
Answer
Clue
Relevancy
microphone
Clue
Emile Berliner's 1877 good idea
Definition
an instrument whereby sound waves are caused to generate or modulate an electric current usually for the purpose of transmitting or recording sound (as speech or music)
phonograph
Clue
Thomas Edison's 1877 good idea
Definition
a character or symbol used to represent a sound, esp. one used in phonography; also, gramophone
ophelia
Clue
Shakespeare character who says "Good night, ladies; good night, sweet ladies; good night, good night"