pitch – n. the highness or lowness of a sound

unconscious – adj. not intended or planned : not consciously done

prefer – v. to like (someone or something) better than someone or something else

competence ­– n. the ability to do something well

subtle – adj. hard to notice or see : not obvious

cue – n. a sign that tells a person to do something

bias – n. a tendency to believe that some people, ideas, etc., are better than others that usually results in treating some people unfairly