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Fundemental and harmonic frequency

Hi i was just wondering what exactly are fundamental and harmonic frequencies whats the difference between the two and what is their significance. iam sure that i know what those r but its probably the just terms that iam unfamiliar with.Also if you guys can give out a few links to read about would be most helpful to me.

EQing the top-end of the frequency spectrum

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When checking commercial songs (in 44.1 kHz) with a spectrum analyser, I often see a sharp roll off in frequencies at around 20 kHz or so. Why exactly is this done? In order to make the fact that the frequencies are abrubtly cut off at 22050 Hz inaudible? So is this something I should be reproducing by using a low-pass filter with a sharp Q (I'm using 20504 Hz, Q of 5.79)?

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