Question

 When were the first earphones released?

Answer They were receiving instructions and timings. Also, because sound travels much slower than light, each performer would have had the music directly in their earphones to ensure they all stayed in time.
http://wiki.answers.com/Q/When_were_the_first_earphones_released

Top Q&A For: When were the first earphones released

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AKG's are good and most are black and gold
http://answers.yahoo.com//question/index?qid=20120907233644AAAR8SA

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