You may never have heard of an odd, electronic musical instrument called a Tenori-on, but – ta-daa! – you can now get a kind of fake, unlicensed, and not-quite-as-good software version for your iPhone. (Which is just as well as a real one costs £750.)

It presents you with a grid of squares; tap them to light them up. It 'plays' in a loop, from left to right, sounding a note when the playhead hits one of the activated squares.

John Williams's job is safe for serious composition, of course – and anyway, though you can save creations within Melodica, there's no way to export them – but my, it's fun.

It's almost impossible to create a tune that doesn't hang together and sound great in a quirkily.

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