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Cross tuning or cross-tuning is an alternative tuning used for the open strings of a string instrument. The term refers to the practice of retuning the strings; it also refers to the various tunings commonly used, or in some contexts it may refer to the AEAE fiddle tuning. In folk music traditions, cross-tunings are used to give the instrument a different sound by altering the pitch of string resonances and drones. It may be notated in the normal way, with notes written at the sounding pitch, or the written notes may represent the finger position as if played in regular tuning, while the sounded pitch is altered.