...Atari 800XL was used for the lead piano/organ sound.
Texas Instruments TI-99/4a as lead guitar.
8 Inch Floppy Disk as Bass.
3.5 inch Harddrive as the gong.
HP ScanJet 3C was used for all vocals...
You can see the original version performed by Queen here.
I was aware of the song because it was used in one of my favorite movies, Wayne's World: