Riddle

I shake, but unlike the strength of an earthquake. You can find me both high and low, usually out of control. I can be considered both good or bad, sometimes used for both happy or sad. What am I?

Choose an answer

A.A tremor
B.Vibrato
C.A trill
D.Singing Pitch.
Hint: It's a 2-word phrase with 12 letters, starting with "S".

Answer

Singing Pitch.

Why this is the answer

A singer's vocal pitch can "shake" with vibrato, rising and falling emotionally, unlike the destructive shaking of an earthquake.

This riddle is filed under How, What, Why Riddles and rated Hard.