Those of you old enough to have been alive during the NES era may recall seeing adverts for Miracle Piano Teaching System, released in 1990. It aimed to teach kids how to play the piano via the on-screen instructions delivered using the NES itself, but despite its groundbreaking nature, it wasn't the first device of its type.
As Game Dave shows in the video above, Konami actually attempted the same trick in Japan in 1987 with Doremikko. Released for the Famicom Disk System, this package came with its own no-frills, Konami-branded keyboard, which plugged into the console via its expansion port at the front.
By modern standards it's pretty basic, but at the time this was quite an innovation - it's just a shame it never got released outside of Japan.