Why is the mystery of Beethoven's "Immortal Beloved" significant in music history?

It’s one of the greatest unsolved mysteries in musical history. Who was the woman who so besotted Ludwig van Beethoven that he was compelled to pen an infamously passionate and fervid love letter that has stood the test of time? The identity of Beethoven’s “Immortal Beloved” (more accurately translated as “Eternally Beloved”) has confounded historians for two centuries and even inspired a movie. But the truth may never be known for certain.

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melody. a series of single tones which add up to a recognizable whole is called a what kind of layers of sound are heard melody or harmony. how many layers