Artist/woodworker Tor Clausen turned a slaphappy, musical lunch at a picnic table into a couple of patents, and then he turned a couple of patents and the family woodworking tradition into a business making solid hardwood musical furniture.
Tor Studio makes playable coffee tables, storage chests, even porch swings, but they also make kid-sized tables with a marimba built into the top. [The matching musical chair taunts us from the website; production will hopefully resume soon.]
The kid's furniture comes in the same traditional stains as the other pieces, or in a more whimsical [...] primary colored finish made of non-toxis German wax paint. [I don't know, either, just that there's no white or black.]
Musical Furnishings, $600-900, plus apparently supercheap UPS shipping
The one-table-band with drums, chimes and cymbals is $1,400 [musicalfurnishings.com via notcot.org]