A training device includes a tubular sleeve mounted to the guitar neck. The sleeve extends along a longitudinal length of the guitar neck and has an open and a closed end portion. A plurality of light-emitting diodes are connected in series and nested within the sleeve. The light-emitting diodes extend along a length of the sleeve and are selectively illuminable. Each light-emitting diode displays one of a red color or a green color, wherein same interchangeably displays the red and green colors. A mechanism is included for automatically illuminating the light-emitting diodes in a sequence corresponding with a desired one of the chords, scales and riffs. The illuminating mechanism is coupled to the light-emitting diodes, mounted to the guitar, and includes a control switch that extends outwardly from the housing. A transformer is mateable to the illuminating mechanism for converting a 110-volt power supply to a 4.5-volt power supply.