Amusical sound has: a. A perceivable pitch and a measurable frequenc b. A certain volume c. A certain duration d.All of the above

The correct answer is d. All of the above.A musical sound has a perceivable pitch and a measurable frequency, a certain volume, and a certain duration. Pitch refers to the highness or lowness of a sound, which is determined by the frequency of the sound wave. Volume refers to the loudness or softness of a sound, which is determined by the amplitude of the sound wave. Duration refers to the length of time a sound is heard. All of these characteristics are essential for a sound to be considered musical.