Did you know that the volume you listen to music at can have a profound effect on how you perceive the different frequencies of that music, eg the bass, mid and treble? And that there’s actually a specific volume level that is the “right” level, where we hear all of the frequencies as they really are?
Far from being esoteric theory, this stuff is actually hugely important for DJs and DJ/producers, because it means that if we want to hear our music as it really is, not only do we have to listen to it through decent, well-positioned speakers in a room that sounds good, but we have to do so at the right volume, too.