Dulcimer-Ukulele WHAT
General mountain dulcimer or music discussions
John, I think you really need to just start playing with people rather than trying to think too hard about this and just confusing yourself even more. As we've seen, the most common keys played in multi-instrument jams are C, D, G, and A.
The most important chords in any key are the I, IV, and V chords. In D that means D, G, and A. In G they are G, C, and D. In A they are A, D, and E.
Tuned to DAd, all those chords exist on the fretboard. So start by learning those chords and practicing them so your fingers can get to them quickly and without having to think too much.
That leaves the key of C. The I, IV, V chords in C are C, F, and G. If you have a 1+ fret, you can play an F as as bar chord at 1+. If you don't, play a partial F sticking to the C and A notes. Perhaps 6-7-6.
So without retuning and without using a capo, you can get the main chords in the 4 main keys. Start there.
At some point you will realize that you also need to play some minor chords. The minor chords that come into play are the relative minors of each of the major chords. One reason I don't agree with Skip's suggestion of tuning to a 1-3-5 tuning (D F# A) is that you would still have to learn minor chords. If you tune DAd or DAA, your barre chords can serve as either major or minor. So 0-0-0 is D or Dm; 1-1-1 is E or Em; 2-2-2 is F# or F#m, 3-3-3 is G or Gm, and so forth.
Don't keep wondering about this stuff. Just learn your chords. The ukulele group will share lyrics sheets with chord names and perhaps a strumming pattern for each song. Join their jam. Play the chords you know. Skip the ones you don't. They'll do a lot of the same tunes each time, so you can prepare ahead of time and learn the chords you don't already know.
In my mind, that is the simplest thing to do without diving into music theory. No retuning. No capos. Just learn your chords.
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However, I mentioned in an earlier post in this thread that when I only have my standard dulcimer at a multi-instrument jam, I use a capo for the keys of G and A and retune to CGc for tunes in C. Then my fingers pretend I am playing in D. Here is a video I made years ago explaining how to use the capo for that purpose:
Personally, I don't think of chords by their names. I think of them by numbers. This chart will help you know what chord shape in D you would want to use for chords in other keys.
Basically, to transpose, stay on the same row. Here are some examples, all assuming you are tuned DAd or DAA:
If you are playing in the key of G with the capo at the third fret, and the music calls for a G chord, use the fingering for a D chord. If the music calls for an Em, use the fingering for a Bm.
If you are playing in A with the capo at the fourth fret, and the music calls for a D chord, use the fingering for a G chord. If the music calls for a Bm, use the fingering for Em.
If are you playing in C and are tuned CGc or CGG, and the music calls for an Am chord, use the fingering for a Bm chord. If the music calls for an F chord, use the fingering for a G chord.
What this approach allows you to do is to "pretend" that you are playing in D all the time. You don't have to retune or learn new chords. Everything you have learned in your open DAd or DAA tuning is available to you.
Over time, your ear will also let you know when the music moves from a I chord to a IV chord or V chord. Each chord has a different feel. And then you'll start to hear the relative minors and a handful of other chords. Pretty quickly, you won't need this chart at all.