Subliminal Talk

iTunes has that small display on top which shows data about the track currently playing (name, artist, progress), and if you click the arrow on the left, it shows all those bars going up and down instead (does this have a specific name, by the way?)

Soooo, is it normal that when playing the silent track, those bars don't move/aren't there?

Yep that's normal, it's called an FFT (Fast Fourier Transform) analyzer. The bars don't move because it seems to be coded to analyze only the audible frequency range. So that's normal