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Among the more widely known facts are EEG-research programs , that proved a resonance-like rapport of brain waves upon external optical or acoustic stimulation. The brain's own frequencies tune in with the frequencies of the stimulus, an effect called "photic driving" or "frequency following response" (ffr). Some frequency spectrums and areas are associated to psycho-physical states (and Greek letters), but these measurements do not seem apt to really cover the complex wave activities of the brain, and they only offer a vague outline of a theory of psycho-physical music.