What are partials in a complex sound?

• A. The different frequencies of a complex wave
• B. The loudness levels
• C. The attack phase of a tone
• D. The tempo changes in a piece

Answer: (A)

Partials are the different frequencies that make up a complex sound. When you hear a note, you’re not hearing a single pure frequency—it’s a sum of several sine waves at different frequencies. Those component frequencies are the partials, with the lowest one typically being the fundamental pitch and the higher ones often forming harmonics (integer multiples of the fundamental). The particular mix and strengths of these partials shape the timbre, or color, of the tone. So this describes the actual spectral content of a complex wave. The other options relate to how loud components are (amplitude), the envelope’s attack phase, or timing/ rhythm changes, none of which define the spectral components themselves.