Answer: Jack
The full line is, "And since I am dead, I can take off my head to recite Shakespearean quotations. No animal now man, can scream like I can, with the fury of my recitations." This is the second song in "The Nightmare Before Christmas". Jack is telling the audience about how he is sick of being the best at Halloween scaring, and wants to do something else. The quote basically is part of his description about how good he is at his job.