Listen to Solfeggio Frequency (639Hz) Quiet Thoughtful Tranquility online. Solfeggio Frequency (639Hz) Quiet Thoughtful Tranquility is an Instrumental language song and is sung by Shivoam. Solfeggio Frequency (639Hz) Quiet Thoughtful Tranquility, from the album Healing Capabilities Solfeggio Frequencies, was released in the year 2024. The duration of the song is 1:00:00. Download Instrumental songs online from JioSaavn.