Robot guitar player

Stumbled upon a video in which a robot assembled on the basis of Lego Mindstorms with music repeats the movements of a guitarist. Made cute and very cute. According to the author, he used the details of the basic set of Lego Mindstorms NXT 2.0 (3x NXT Servo Motor, Color Sensor, Ultrasonic Sensor). The program is strictly time bound, i.e. the robot does not respond to the melody.