Final answer:
The sentence in question is an example of simile, as it directly compares the singer's high notes to 'jagged knives'. This use of simile helps create a vivid and descriptive image, enhancing the impact of the sentence.
Step-by-step explanation:
The sentence in question is an example of simile.
A simile is a figure of speech that directly compares two unlike things using the words 'as' or 'like'. In this sentence, the singer's high notes are compared to 'jagged knives', emphasizing the sharp and piercing quality of the sound.
This use of simile helps create a vivid and descriptive image, and adds to the overall impact of the sentence.