I realize that this may come as news to you, so I shall break it gently.
There are volumes other than floor-shakingly loud.
Look at the volume control on your music player. It has options for louder and for softer. You can play your awful music at a volume that I can't hear through the shared wall.
Now turn your attention to the television, and examine the volume control on it. You will notice the same options. I recommend trying the less-loud versions. You will still find yourself able to hear the dialogue, honest. But I won't.
And when you speak—when, for example, you tell your yappy dog to STFU, or when you express your anger and displeasure as you so often do at 10h00 while I am getting down to work—you can do it without raising your voice, and sharing the details of your discussions with me, through the aforementioned shared wall.
Amazingly enough, this also applies to closing doors–it is possible to go into and out of rooms without informing your neighbours that you are doing so. And to walking!
I am sharing this information with you, because it seems clear to me that nobody ever has before. It cannot possibly be that you really have failed to consider that your neighbours might not appreciate your taste in music, television, movies, and that we might prefer not to hear your discussions. I believe that you must feel deeply torn, every time you want to listen to music or watch a movie, knowing that you are inflicting your taste on your neighbours. It is entirely likely that you fervently hope that we are not home, so that you can indulge in your preferred entertainment without disturbing us.
I know that if I had not known about this marvelous ability of modern technology to replay music at less than wall-shaking volume, it would be much more difficult for me to enjoy my love of fine opera.
But now, with this new information that I am sharing with you, you no longer need to worry about us! You can simply turn the volume down, lower your voices, and close the doors instead of slamming them.
I do hope this makes it possible for you to get through your days in a more pleasant, less stressful fashion.
Your neighbour, who works from home.