What does the “hearing aid” type earpiece in musicians ears nowadays do, pipe-in lyrics or music, in stereo?

What does the “hearing aid” type earpiece in musicians ears nowadays do, pipe-in lyrics or music, in stereo?

Question by Ernest A: What does the “hearing aid” type earpiece in musicians ears nowadays do, pipe-in lyrics or music, in stereo? Saw Darius Rucker on Oprah yesterday. Noticed hearing aid type devices in his ears. I’ve seen these d...

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