heh, i sing at work sometimes, usually when I get the feeling people around me think im being to quiet (half the time i work in silence, maby more). I dont consider this a stim at least for me because im using singing differently, for different reasons. OFten i sing along with song being played over the radio but insert my own words to make it funny, and often to rip on some ppl working around me (all good humor) and im very good at it, as typically people laugh and even sing along!
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DX'ed with HFA as a child. However this was in 1987 and I am certain had I been DX'ed a few years later I would have been DX'ed with AS instead.