Tuning the Mountain Dulcimer

In tuning the mountain dulcimer, the top two strings are tuned to the same pitch. There is always an interval of a fourth between the strings: so if the top two strings are a "G," then the bass string or melody string is a "C." If there are four strings, then the bottom two strings are tuned to the same pitch. "DO," or the first note of the scale, should fall on the third fret of the top string.