Listen to Concentration & Relaxation online. Concentration & Relaxation is an Unknown language song and is sung by Restful Sleep Music Consort. Concentration & Relaxation, from the album Deep Sleep: 111 Tracks to Help You Sleep, Relaxing Music for Trouble Sleeping, Calming Sounds for Sleep Meditation, Rest & Relaxation, was released in the year 2016. The duration of the song is 3:25. Download Unknown songs online from JioSaavn.