2.718 Hz Binaural Beat (Natural Exponential)

Ten hour binaural beat with frequency e, the natural exponential (approximately 2.178 Hz). This frequency lies in the mid-delta range, and like all delta beats, is best used for meditation, sleep, and relaxation. *DISCLAIMER: While famed Swiss polymath Leonhard Euler (along with Jacob Bernoulli) did discover the constant on which this beat is based, he was not directly involved in its creation, having died in 1783. He will have to be content to be remembered as one of the greatest mathematicians to have ever lived.