I was confused by your response and all the comments here, so I checked with my parents and I've just plain misremembered a shruti box! https://en.wikipedia.or

I was confused by your response and all the comments here, so I checked with my parents and I've just plain misremembered a shruti box! https://en.wikipedia.org/wiki/Shruti_box https://en.wikipedia.org/wiki/Shruti_box Shows how much my disinterested self-involved 7-year-old self gave a shit about learning music :-D