I preserve unusual media. This 1998 relaxation tape claims to have "binaural beats" and "subliminal messages" meant to induce sleep. Your mileage may vary. It's kinda pretty, though. : r/cassetteculture
9 Best Binaural Beats Apps For Android/iOS/PC (Free & Paid)
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Mind machine - Wikipedia
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Binaural Beats Machine on the App Store
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