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" A Shepard tone, named after Roger Shepard, is a sound consisting of a superposition of sine waves separated by octaves. When played with the bass pitch of the tone moving upward or downward, it is referred to as the Shepard scale. This creates the auditory illusion of a tone that continually ascends or descends in pitch, yet which ultimately seems to get no higher or lower. " -
This is a super deep ascending Shepard tone. If you listen closely it seems to ascend to higher and higher levels the longer you listen. It is an auditory illusion known as the Shepard tone which is often used in movies and music to effect you often without you realizing it. The Shepard tone here is super slow and deep and was designed to aid with relaxation, focus, studying, and sleep.