Quantity   Component name
1 × Arduino Mega
1 × Adafruit Music Maker Shield https://www.adafruit.com/product/1788
1 × 8Ohm Speakers
1 × USB extension cable
1 × 3mm thick plywood
6 × 2mm diameter magnets
1 × Metric nuts and bolts
1 × Black acrylic
12 × Laser diode modules (650nm, 5mW) https://www.amazon.com/gp/product/B00R73MC1S/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
12 × Photoresistors
12 × 1kOhm resistors
12 × 30 kOhm resistors
1 × Rotary encoder
12 × npn transistors
1 × 28BYJ-48 ULN2003 5V Stepper Motor + ULN2003 Driver Board
1 × Latch pushbutton
1 × Power switch
1 × 5kOhm potentiometer
1 × 12V power supply
1 × Audio jack
1 × Hall effect sensor
1 × Momentary pushbutton