Since I prefer music, I have been buying CDs from the Dr. Jeffrey Thompson series from Amazon. So far, have purchased the Music for Brainwave Massage (the first and 2.0 - I like them best) as well as Healing Mind (the first and 2.0), Awakened Mind (2nd best) and Creative Mind (3rd best). There are others including Music for Relaxation and Music for Meditation. The cost was minimal and each CD is different so they do not feel repetitious when listening to them. Oddly, I seem to get better results when listening to them without headphones but that just may be me.