system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If the Human Voice resonates at multiple frequencies, how are we able to perceive singing as a single pitch?

In my Phonetics class, we’ve talked multiple times about how the voice resonates with multiple frequencies, since there’s multiple “chambers” for it to resonate in. That leaves me confused then, with the titular question—how are we able to perceive singing as marching up with notes that are a single frequency?
gpt
The voice is a harmonic sound, meaning it produces frequencies in a harmonic series.  Lots of sounds are harmonic, so we've learned to hear the entire harmonic series as "one sound", since it all probably comes from a single sound source, and the pitch is the frequency the series starts on (also called the fundamental frequency.)