Imagine yourself trapped in a dark room which has three enemies and one friend. How will you recognize your friend on the basis of his voice?
Pitch
Frequency
Quality
Velocity
Two people, with different quality of sound, may have same frequency, velocity and pitch.
Imagine that you are Lord Ullin. You bemoan and lament the tragic loss of your lovely daughter and curse yourself for having opposed her alliance with the chieftain. Express your feelings of pain and anguish in a letter to your friend.