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"My husband was AMAZED when he opened his present to find his high school quartet on a CD!!! He thought it was truly UNIQUE!! I was very happy with the restoration. These recordings were made in someone's basement almost 50 years ago & sound so clear. (I was not even sure that your company would be able to GET any music off of them!!) Thank you ..."

Beat

A successive rising and falling of a wave envelope due to alternate reinforcements and cancellations of two or more component frequencies.