Middle C

Find any group of two black keys. The white key immediately to its left is C. Repeat that pattern toward the center of a full-size piano: the central C is called C4 in scientific pitch notation. On a smaller keyboard, “middle” can be a misleading physical description, so use C4 or your instrument's octave labels.

Middle C is a useful anchor, not a privileged note in every melody. Once you know it, move by letter names and staff steps instead of hunting from the beginning of the keyboard every time.

In treble clef, C4 is just below the five lines, on the first ledger line. In bass clef, it is just above the five lines, also on the first ledger line. A ledger line is a short extension of the staff drawn through one notehead.

The grand staff joins treble above bass. C4 sits in the gap between them. The note below it is B3 and the note above is D4, whether you approach from the top or bottom staff. The Staff and Clefs explains how the clef assigns names to all other lines and spaces.

At the common tuning of A4 = 440 Hz and twelve-tone equal temperament, C4 is about 261.6 Hz. That number identifies its pitch, not its volume or instrument sound. A piano, flute and voice can all produce C4 with different tone colors.

Play C4 and then C5. The second is an octave higher, even though both keys have the letter C. If you are reading music, the octave number keeps them apart.

Write or point to C4, then name the neighboring staff positions: B3 below and D4 above. Continue one step at a time to A3 and E4. Check each answer on a keyboard only after naming it. The aim is to see a direction and distance on the staff, then hear it.