I have heard of the tapes by Pat Joudry. In fact, one of the books I ordered from Superlying...sorry, Superlearning was the book written by her, about her experiences "Sound Therapy for the Walkman". It was an interesting, yet dated, read! Before anyone rushes out to buy the tapes, which cost an arm and a leg, I would suggest a visit to the Centerpointe site to check out a tape called "Silent Stim" which, it is claimed, produces the same effect (Tomatis effect) as the Joudry tapes, and I believe was also created well after them. Notice the price diference! I have "Silent Stim" and I like it!