Musical instruments are Muktza, set aside for non-Sabbath use, as they are delicate and regularly require fixing and/or tuning as part of their regular use. Due to this, a Rabbinic restriction on handling musical instruments was enacted specifically because of "Makeh B'patish. For example, if a guitar string is slightly out of tune, even though the whole instrument is not considered broken, the string requires tuning to bring the entire instrument to its desired state. As such, the corrective tuning renders an act of Makeh B'patish" on the whole instrument. The guitar's said to be 'in tune', ready for usual use. This is considered a significant enough improvement to be an act of "Makeh B'patish".