I think I agree with everyone.
The closest ting to a Fakebook for dulcimers are the various Join the Jam books by Stephen Seifert. And there are several of them, the original two volumes in both DAA and DAd, one on Gospel tunes, one that plays across the strings in the "low octave," and more recently a couple of video series where you can watch him play while you play along.
And there are lots of free resources online. On the "Resources" page of my website (don't worry; I have nothing to sell, so I'm not trying to drum up business) I have a category entitled " Free Dulcimer Tab Online ." Follow those links and explore!
But as Strumelia says, dulcimer players do not exist in a vacuum and many of us play with other musicians. There are lots of bluegrass and old timey fake books that might also be of interest. She describes them well. The online versions allow you to play either fiddle versions or midi files so you can hear the basic melody. (I have links to some of them on my website, too.) And because certain songs are often played in a standard key, I think it's good to learn the songs in that key. Soldier's Joy is indeed usually played in D ("hooray" says the dulcimer chorus), but Red-Haired Boy is usually in A, Temperance Reel is usually in G, and so forth.
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Dusty T., Northern California
Site Moderator
As a musician, you have to keep one foot back in the past and one foot forward into the future.
-- Dizzy Gillespie