What is the term for the set of frequencies that are integral multiples of the fundamental?

• A. Harmonic set
• B. Overtone series
• C. Partial lineup
• D. Timbre family

Answer: (A)

Harmonics are the frequencies that are integer multiples of the fundamental. If the lowest frequency is f, the harmonics appear at 2f, 3f, 4f, and so on. Collectively, these frequencies form the harmonic series, which is also described as the overtone series in many contexts and is what gives instruments their characteristic timbre. Naming the set of these frequencies as a harmonic set fits the question because you’re talking about a group composed of harmonic frequencies that all relate to the fundamental by simple integers. The overtone series describes the same idea, but the phrasing here emphasizes the collection itself as a set of harmonics. The other options don’t capture this precise idea.