A stringed musical instrument combination of at least two traditional stringed musical instruments or of nontraditional stringed musical instruments or a mix of traditional and nontraditional. The combination presents the advantages of rapid exchange while playing, reduced storage or transportation volume and a lower cost than two separate instruments. The preferred embodiment is a Fiddolin, a commercially available violin modified to present a mandolin on its back face. The string tension requirement is solved by having additional structure to mount the mandolin pegs into and the angularity needed to keep the strings pulled over the nut by channels or lumens to conduct the strings through.