Some years ago, a group of frustrated people in Scotland decided that the pleasure of playing in an orchestra should not be limited to those who are good enough to do so, but should be available to the rankest of amateurs. So we founded the Really Terrible Orchestra, an inclusive orchestra for those who really want to play, but who cannot do so very well. Or cannot do so at all, in some cases.
My own playing set the standard. I play the bassoon, even if not quite the whole bassoon. I have never quite mastered C-sharp, and I am weak on the notes above the high D. In general, I leave these out if they crop up, and I find that the effect is not unpleasant. I am not entirely untutored, of course, having had a course of lessons in the instrument from a music student who looked quietly appalled while I played. Most of the players in the orchestra are rather like this; they have learned their instruments at some point in their lives, but have not learned them very well. Now such people have their second chance with the Really Terrible Orchestra.
Some of the members were very marginal musicians, indeed. One of the clarinet players, now retired from the orchestra for a period of re-evaluation, stopped at the middle B-flat, before the instrument's natural break. He could go no higher, which was awkward, as that left him very few notes down below. Another, a cellist, was unfortunately very hard of hearing and was also hazy on the tuning of the strings. As an aide-mémoire, he had very sensibly written the names of the notes in pencil on the bridge. This did not appear to help.
*In the old-school, before-punk-became-a-genre, sense.