He compares his voice to music because he “likes to hear him speak, but [he] knows well / [this] music has a much more pleasant sound” (Shakespeare 9 -10), because no voice would be as pleasant as the music, further ridiculing the conventional love poem. The speaker's tone changes in the final quatrain, as he likes the way she speaks but her sound is not as pleasant as the music. The speaker's appreciation of his mistress is evident, as his comparisons are not as harsh in the third quatrain as in the first two quatrains. The flaws he describes almost begin to idealize his mistress. Go through the sonnet, he begins to half-heartedly glamorize her beauty and we learn that, for him, her flaws are what make her beautiful and his love for his mistress is revealed. From the way the speaker speaks in the final rhyming couplet, we see the speaker recognize his true beauty as all his flaws are not enough to put him off, as he lists all his imperfections but does not complain, rather he seems to admire as his own. “love as rare” (Shakespeare 13) as any false “denial” (Shakespeare 13)