Middle C

In scientific pitch notation Middle C is designated C4 which is the most commonly recognized in auditory science and in musical studies. The term "Middle C" refers to the note "C" located exactly between the two staves of the grand staff. The frequency of the middle C is about 261.6255653 Hz in equal temperament. However, some musicians prefer to use the term to refer to the C note in the middle of their specific instrument's range. For instance, C4 may be called "Low C" by someone playing a Western concert flute, while C5 would be "Middle C".