Sleeping Music: Healing Solfeggio Frequencies, Binaural Beats, Alpha Waves, Theta Waves, Delta Waves, Soothing Tones an…

Solfeggio product is a streaming-era, functional offshoot of new age and ambient music built around the so‑called "Solfeggio frequencies" (e.g., 396, 417, 528, 639, 741, 852 Hz). Tracks typically present a steady sine or softly modulated tone tuned to one or more of these frequencies, layered with slow ambient pads, drones, and nature sounds. Released primarily for meditation, sleep, yoga, and wellness playlists, the style favors very long-form pieces (from 30 minutes to all-night loops), minimal harmonic movement, gentle dynamics, and unobtrusive textures. Although often marketed with wellness and "healing" claims—sometimes (mis)linked to Gregorian chant—the music’s aesthetic appeal lies in its tranquil timbres, stable pitch focus, and low-information soundscapes rather than in scientifically demonstrated therapeutic effects. As a "product" genre, it developed alongside YouTube and streaming platforms, where search terms (e.g., "528 Hz") and cover metadata strongly shape discoverability.