I'm not sure if my behavior patterns fit the label "stimming". I've never done the classic "hand flapping", so I don't know. Usually, I'm just clacking my teeth. (That's gotten to the point where I had to get the dentist to put a protective layer on my molars, so yeah, I guess that problem is quite serious). I sometimes make the movements of playing a piano, but without a keyboard, just on a table surface or on my leg. It happens unconsciously (and often while there's music playing somewhere, though not necessarily so) but when I become aware of it, I can stop it. It's also apparently only a minor social problem, except that I've been asked by strangers whether I play the piano, which I do, so when people receive that answer, they accept it as an explanation and are usually polite about it. (More so if there happens to be a piano nearby.) When I'm reading a book, I scratch the sides with my fingernails. In stressful situations I also fiddle with objects, shred pieces of paper to confetti size, rock with my chair and flap my legs (did that at school a lot, haven't been in any stressful situations lately so I don't know if I'd still do it), though I've been told those patterns are more often associated with ADD. (It's been confirmed I don't have that, though.)
Oh, and to music I will also nod my head, move my feet and so on - but that can hardly count as "stimming" since NTs do that all the time as well.