Listen to Delta Waves for Relaxation online. Delta Waves for Relaxation is an Instrumental language song and is sung by Solfeggio Healing Mind. Delta Waves for Relaxation, from the album Solfeggio Frequencies 528Hz: Wellness and Mindfulness Music, was released in the year 2022. The duration of the song is 1:47. Download Instrumental songs online from JioSaavn.