A finger-picked 12 is an excellent companion to a hammered dulcimer. Try "Music for a New Found Harmonium", any of the old cakewalk tunes like "Colored Aristocracy", or waltzes like "Two Rivers" or "Far Away". Remember that when playing with a hammered dulcimer, you can give him the chord he needs to build on, but you can also drown him out, so do it sparingly, but with projection.