Listen to Solfeggio Frequency (639 Hz) Stillness Therapy Session online. Solfeggio Frequency (639 Hz) Stillness Therapy Session is an Instrumental language song and is sung by Magical Mystery. Solfeggio Frequency (639 Hz) Stillness Therapy Session, from the album Mystical Healing Frequency, was released in the year 2024. The duration of the song is 1:00:00. Download Instrumental songs online from JioSaavn.