I enjoy hiking, but I'm not very well-versed with the general expectations other people have about noise, especially serious hikers. I generally do trails that take between 3-6 hours, usually up hills/mountains (depending on your definition) on the Appalachian Trail. Often those trails are popular enough that if it's a nice day, I'll see another group every 10 minutes or so, and if there's an overlook at the top there may be a good 8-15 people up there at any point, usually a mix of casual hikers like me and others just passing through on their way up/down the Appalachian Trail.
Some of the groups I've gone with enjoy singing while hiking, or while resting at the top, and a couple of times I've brought an instrument (clarinet) along, to play both during the hike and at the summit. I do enjoy playing like that, but I don't want to bother people unnecessarily; I don't really have a good understanding for how far the sounds carries, or how other hikers, especially serious ones, feel about the music.
Let's assume that the instrument is being reasonably well-played (i.e. gentle tone, not squeaking/squealing, with not so many missed notes as to be distracting), because otherwise I'm sure the answer can't be anything besides "Please stop".
Is there any general etiquette or expectations about playing/making music on hiking trails?
I'm also linking this tangentially-related question on whether playing musical instruments while hiking is sufficient to keep away animals.
EDIT: Well, this was more contentious than I was expecting; answers range from "Hearing music on the trail can be enjoyable" to "Don't even make a sound". I appreciate the feedback from the people of the latter opinion, and I am not ignoring their statements.
Surely, though, there must be a balance, between allowing people who don't want to hear anything that would betray the presence of humankind in the area to enjoy themselves, and allowing people who like music (or especially, in my case, the feeling of playing gentle music in nature) to enjoy themselves as well. At the least, if I play again, I will endeavor to remove myself or my group from other people, to ask anyone nearby if they mind, and in any case to not play for long.
Regardless: if anyone (in the last year) hiked past someone playing snippets from hymns, Disney, and Broadway on a clarinet in the Shenandoah Nat'l park, and found it annoying, I apologize.
EDIT 2, in response to close-votes:
The question was about etiquette - a set of arbitrary, (at least originally) opinion-based, rules that are followed by a majority of people. It's inseparable from people's opinions, but surely it's a useful thing for new hikers to learn.
"Does mild vinegar taste good?" is hardly a useful question for a stackexchange. "Do most people enjoy drinking vinegar?" is an important question for a new chef to know the answer to.