Listen to Tranquil Mood online. Tranquil Mood is an Unknown language song and is sung by Sleep Herbs. Tranquil Mood, from the album Treat Sleep Apnea: Relaxing Music with Didgeridoo for Strengthening the Muscles of the Throat and Tongue, was released in the year 2021. The duration of the song is 5:56. Download Unknown songs online from JioSaavn.