Unlike the violin, the is a
transposing instrument, meaning
sheet music for the is written in a key other than the one where the instrument sounds when it plays that music. Specifically, the is a D instrument, meaning that the 's written
C corresponds to
D on a non-transposing instrument, such as the
piano. The notes given below for tunings are therefore relative to the 's written A, not to a
concert A. The understrings are tuned to vibrate according to the main tuning. For example, when the main strings are tuned A-D-A-E, the understrings are tuned B-D-E-F-A. The tuning largely depends on the region in which the instrument is being played, or the requirements of a particular tune. In Norway, more than 20 different tunings are recorded. Most hardanger tunes are played in a common tuning (A-D-A-E). The hardanger fiddle can also be played in "low bass", the word "bass" referring to the lowest string, (G-D-A-E), the normal violin tuning. In certain regions, the "Gorrlaus" (F-D-A-E) tuning is sometimes used. Many well-known players (such as
Annbjørg Lien) frequently employ E-scale tunings; i.e., instead of A-D-A-E, with tunes being mainly played in a D-scale, the instrument will be tuned to B-E-B-F#, so the tunes are mostly in an E-scale. Going higher still, the player
Knut Buen recorded several albums in an F-scale tuning, C-F-C-G. This is possible only on a smaller-bodied instrument (such as a hardanger fiddle), being rarely attempted on a standard full-sized violin. As a substitute, many fiddlers who play standard violins will simply tune their G string to A, using the A-D-A-E tuning, enabling them to play the same style of music. Another tuning is called "
troll tuning" (A-E-A-C). Troll tuning is used for the tunes, also called the
devil's tunes, as well as the tunes from the
Kivlemøyane suite (thus associated with the
hulderpeople as well as the devil). In the
Valdres district of Norway, using this particular tuning is called "greylighting", a reminder that the fiddler tuned his fiddle like this when the morning was near, and he had played himself through a number of other tunings. Legend has it that the fiddler learned tunes from the devil. This tuning limits the melodic range of the tunes and is therefore sparsely used. ==Technique==