Notes determine duration and pitch of a sound.
Knowing that, and knowing
that the human voice is an instrument in itself, how would you feel if
the only way to speak was to notate out each word, sentence, phrase, or
paragraph? Do we not do that already with words?
are notes, intervals, or key signatures that are equivalent to some
other note, interval, or key signature but "spelled", or named
differently. Why do you think we need multiple ways to write notes,
intervals, or key signatures in western music?