I have heard many other alpha, beta, delta, gamma, theta inducing tracks, and these ones are superior. They have a musical aspect to them, making it easier to enjoy, but also many layers of subliminal and subconscious information that I can truly feel my brain changing when exposed to. The Pure Doses is one of the most worthy tracks to invest in, in my opinion. It is a very high quality mp3, and for $14 you're getting an hour or audio therapy.