Final answer:
A pitch with a dominant frequency that is 'singable' refers to 'perfect' or 'absolute' pitch, which is the ability to identify musical notes such as A-sharp, C, or E-flat by ear alone.
Step-by-step explanation:
The question 'A(n) ______ pitch has a dominant frequency that is 'singable,' asks for the term that describes a pitch which can be clearly identified and sung by the human voice. The answer is d) Perfect. The term perfect pitch, also known as absolute pitch, is the rare ability to identify musical notes such as A-sharp, C, or E-flat just by listening to them. Unlike relative pitch, where individuals can discern the difference between two separate sounds with different frequencies (e.g., 500.0 and 501.5 Hz), perfect pitch is about recognizing the exact note being played or sung without any reference.