This fact was confusing for me back in my school’s chorus. I don’t know if it was confusing to anyone else, but it was to me. How does a person match the pitch

This fact was confusing for me back in my school’s chorus. I don’t know if it was confusing to anyone else, but it was to me. How does a person match the pitch of the piano? I could hear a few different pitches when one note was played (in a confused way, I would zero in on different parts of the sound), any of which might have been the target pitch to be matched. And was I supposed to make my voice sound more like the piano? Was that part of “matching the note?” Complicating things was the fact that my own voice had different pitches in it. Which part of my voice was supposed to match the note? What a time. Now I know I was noticing the fundamental of the piano note at times and overtones at some others. Also, changing the timbre of your voice can mirror the overtones of the piano better, but that isn’t normally the goal of a singer.