This is the first 4 bars of "Twinkle Twinkle Little Star" written in JSONg, which can be played with the emulator here: https://codepen.io/trezy/full/eYZGxXY

twinkle-twinkle-little-star.json

[
	[
		["C3"],
		[4, "C2", "E2", "G2"]
	],
	[["C3"]],
	[["G3"]],
	[["G3"]],
	
	[
		["A5"],
		[2, "C2", "F2", "A3"]
	],
	[["A5"]],
	[
		["G3"],
		[2, "C2", "E2", "G2"]
	],
	[[]],

	[
		["F3"],
		[2, "D2", "F2", "A3"]
	],
	[["F3"]],
	[
		["E3"],
		[2, "C2", "E2", "G2"]
	],
	[["E3"]],

	[
		["D3"],
		[2, "F2", "G2", "B3"]
	],
	[["D3"]],
	[
		["C3"],
		[2, "C2", "E2", "G2"]
	],
	[[]]
]