Tuning/playing in C ?
General mountain dulcimer or music discussions
I wish tuning to C were the norm, for that would simplify explaining music theory on the dulcimer since we wouldn't have to deal with sharps and flats.
So far, people have cited two reasons for playing in C: because the specific dulcimer sounds good in that pitch and because it is easier to sing some songs in that pitch.
Both of those reasons make sense. Once upon a time luthiers would tune their dulcimers to whatever pitch resonated most profoundly on that particular instrument. They would "hoo in the hole," meaning sing into the soundhole and identify the most resonant pitch and then tune the instrument to that one. And as for singing, there are indeed some songs that I can't sing in D because the melody ends up too high, but I can in C. However, the opposite is also true. And sometimes I have to sing in G or A. It all depends on the range of each particular song. (Look up the words "authentic" and "plagal" if you care about the official terms.) The fact is all twelve keys exist in whatever my limited range is, but for any given melody only a few might fit.
Let me offer two other reasons. I find on a standard dulcimer I can tune as high as E or as low as C without changing strings. When I fingerpick slow tunes, I prefer tuning down to C or C# because of the extra "give" in the strings. It allows your picking fingers a bit more control and creates a softer tone. But when I flatpick faster tunes, I tune up to Eb or E because the tighter strings are more responsive to the pick.
And secondly, one of the professional dulcimer players confided in me that when he plays in the instructor concerts at festivals when several people all play short sets, he tunes down to C or C# so that his dulcimer seems richer and warmer compared to all those who came before. I do think there is something to this. Play a tune in D a few times and then tune down a step or half step and play it again. It will seem deeper and richer to your ears in comparison.

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I was busy working all day yesterday and then spent the evening driving to SF to pick up my daughter at the airport. I didn't check in here until I got a break from work today.