#1: get it
It's perhaps used a bit lazily at times, but when I recently stated that 'Tietchens (but in fact could be referring to anything) doesn't get it' in a recent comment I meant that in a quite nuanced sense. It isn't that he misinterprets it or misunderstands it even though the phrase is commonly used in that way. It is revealing of a deeper unspoken undercurrent of disharmony. These deep disharmonies exist between people and either manifest themselves in often rather small seemingly petty ways which act to hide the deeper issue, or in other cases our prevailing desire to get along with one another makes them elusive to the point of invisibility.
The it is a very small, seemingly insignificant, yet highly potent word that all of us use with casual abandon (as with many others I've previously discussed in the SIGNIFICANCES series). Of course often a very simple pronoun along the lines of 'what colour is your car? it's red'; and in contrast, a word that can encompass vast ineffable belief systems, for example, 'I really want to get away from it all'.
We'll tend to accept this latter statement without asking for clarification to what 'it' or 'it all' represents through a real-time application of our own unique contextual it domain. Arrogant perhaps, but the nevertheless fundamental nature of most discourse. In this same way, and going back to the original example, you can see that there's no direct way of explaining get it, so what follows is my indirect way that will really leave your head spinning and is the nearest thing I'll get to ever explaining my music. Don't continue reading to avoid that, even though it'd be a good sign.
Artistically speaking, if you hear it then you get it, if you don't understand it then you get it, if you understand it then you get it, if you misinterpret it then you get it, but if you want not to understand or interpret or hear then you don't get it. But you can't have the arrogance to experience it as if there wasn't something not to know, the knowing of which would make a difference, absolutely.