I got this, Miracle piano teaching system for NES sealed. I know the history on it, and know it was $500 in 1990 when it came out. But I've only found 2
How one man's determination to resurrect a "miracle piano" helped heal Japan's tsunami scars - CBS News
Miracle Piano Teaching System For Sega on Mercari | Piano teaching, Piano, Best piano keyboard
Wonder Stuff? (SOS Nov 93)
The Miracle Piano Teaching System Nintendo NES BOXED Used
Miracle Piano Teaching System - Bundle for NES | Gamers Paradise