Applying to some stringed instruments, one can utilize the vibrational properties of the string to create a purer harmonic tone (i.e. one with fewer overtones). On a guitar, for example, lightly place one finger on the string above the fifth fret and pluck the string sharply. The sound that emits is a harmonic frequency that is a multiple of the string's base frequency; in this case, a fractional multiple. This can be used to produce cool sounds, and also to tune the guitar or other stringed instrument more accurately.