'The grammar is fine, but the first example is not idiomatic. It's a question of common expressions. ," it would be okay.
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Anonymous'I cannot play on a flute.'
'I cannot play the flute.'The grammar is fine, but the first example is not idiomatic.
It's a question of common expressions.
If you put it more generically, "I could not play a single note on a/the flute!," it would be okay.
Even in this case, "the" would be more natural to a native speaker.