Hi Tony

haha. Maybe this will help. If you play a note on a piano, you will hear the loudest or fundamental note the most. You will also hear other pitches, partials or harmonics only softly.

So if you play the note C on a real piano, you will also hear these partials in this order: G, C, E, G, Bb, C, D, E, F# etc. The partials keep getting closer to one another.

To get an acoustic piano in tune you need to take into account all the partials. When a piano is tuned the tuner strikes the fundamental note and then they usually tune the octave higher using the partial that sounds one or two octaves above the fundamental tone. Or something like this gibberish