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As an American with (apparently) okay pitch this was easy to ace, but without a "Never heard this" button I don't see how the results can be meaningful. Assuming an international audience, surely the number of missed due to not knowing the song must be non-negligible - if not indeed higher than the number of misses due to poor pitch!

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It's a "standardized survey in use for over 50 years" by the National Institute on Deafness and Other Communication Disorders, so I imagine it assumes an American audience familiar with western music and its tropes.

25/26 and I didn't recognise 1/4 of the tunes. It's harder when you don't know the tune, but it's possible to tell where the tune should be going.

Sure. Nonetheless when you don't know the tune, the test measures a different quantity than it was intended to.

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