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The video shows the "bandpass" from different capacitor values used as coupling capacitor in audio circuits (20 Hz - 20 KHz). The "sound" changes completely with different values, and 1 series capacitor in the audio signal line can be used as audio filter (though the characteristic is far from ideal, complete audio bands are shut off, so not very selective!).
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More audio in my book: "Schematics 2, audio amplifiers and loudspeaker boxes" ISBN 978-1-4475-7336-4.
Please note: the capacitor value and its effects also depends on the input resistance from the electronic stage to which it is connected (4-pole-theory). This means that with a high-impedant input stage (like a tube grid or a FET gate), the effects will be (somewhat) else. In the showed demo the input resistance is approx. 3-4 K (bipolar transistor). This low impedance input gives damping.