Three things I’ve learned about listening.

@jmalen123 

“The worlds music is at our fingertips.”

Absolutely.

does this apply to biasing your tube amps? I mean they sound great right now, but I'm due for checking the bias...

Op Iam glad you put this thread.The more l  listen to my system my listening skills get better. Even if your system is already good, one day you notice something that is missing, like bass , clarity, speed, texture, soundstage. Before I will make a tweak, I will listen to my reference cd or vynil. From country, jazz, classical, even rock. Then I will figure it out if I still want to make changes.

@katzenjammer27 

I don’t think biasing counts. 
it’s regular maintenance.

I, too, don't understand this hobby. I'm here to learn and offer what little I know to others who are asking. I enjoy the music. I am not obsessed with perfection. I am happy with what I have and I am currently focusing on room improvements. This is also a secondary hobby and the primary one (astrophotography) takes up much more time and focus and can also become a money pit or you can learn to make what you have work to its best capabilities. I fall into the later category. I'm willing to fiddle with what I have to improve things and create a better product. 

My son has at least a dozen bowling balls, yet with my 3 balls I held a league average higher than he has yet to achieve. Why, because I focused on what I had and learned to work with those items. He, on the other hand, seems to be trying to buy a higher score. It doesn't work in bowling, astrophotography, or in this hobby. Albeit in the audio you can buy a system that needs less "help" from its environment. 

I fully agree with @rvpiano 's 4 points.

1. If you listen for sonic problems you’ll find them.

2. Since it is a hobby, you feel you have to play with it.

3. If it sounds really good, leave it alone!

4. Start enjoying the music!