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Over 3 Hours of Beta Waves Total Focus & Concentration Binaural Beats & Isochronic Tones Music & Nature Sounds

Beta Waves for Reading & Writing - 13.7 Hz Beta Frequency Binaural Beats

Binaural Beats Research / David & Steve Gordon

专辑：Over 3 Hours of Beta Waves Total Focus & Concentration Binaural Beats & Isochronic Tones Music & Nature Sounds
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