Linear Voltage Regulators (LDO) - Applications, Heat Sink Example, Shunt Regulator 

That "intro noise" is used to draw the oscilloscope figure, that you see in the intro. The oscilloscope is set to XY-mode and the left and right audio channels are connected to the two scope channels. You can find some "better sounding" oscilloscope music examples, e.g. here ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ywdRQ3zU6Uc.html