The nyckelharpa is a Swedish instrument with 16 strings and 37 keys. The keys slide under the strings to dampen or fret them by reaching up to the string; the strings are played with a bow. The earliest evidence of a nyckelharpa is an image dating back to 1350 C.E. and the oldest existing instrument was built in 1526 C.E. Pictured is nyckelharpa player Bronwyn Bird.