Wonderful "pink noise" that works well for me . if you're bipolar (or just need to get some sleep at night) try it for yourself ~~ sweet dreams. Pink Noise: Pure Sound For Relaxation, Increased Concentration
Kaki King, the first female on Rolling Stone's "guitar god" list, rocks out to a full live set at including her breakout single, "Playing with Pink Noise." Jaw-dropping virtuosity meets a guitar technique that truly stands out.