If Beethoven had written:
- "Rock and roll is here to stay,
It will never die,
It was meant to be that way,
Though I don't know why.
I don't care what people say,
Rock and roll is here to stay.
That would be unintelligible, because it belongs to no known genre of music from Beethoven's time.
Instead, Beethoven's music could never be mistaken for Danny & the Juniors, and indeed, we're convinced that both Beethoven and Tchaikovsky rolled over under the onslaught of such "noise". ;-)
So in this case, "unintelligible" simply means unrecognizable as a certain category of music, in this case, Beethoven quartets.
