The featured electronics are listed in the YouTube description:
a. HP Scanjet 3P, Adaptec SCSI card and a computer powered by Ubuntu v9.10 OS as the Vocals. (hey, the scanner is old)
b. Atari 800XL with an EiCO Oscilloscope as the Organ
c. Texas instrument Ti-99/4A with a Tektronix Oscilloscope as the Guitar
d. Hard-drive powered by a PiC16F84A microcontroller as the bass drum and cymbal
Two years ago, BD594's version of Queen's "Bohemian Rhapsody" made waves:
For more videos by BD594, visit his YouTube channel.