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A ledger line is a short horizontal line added above or below the musical staff to notate notes that lie outside the normal five-line staff.
What is a ledger line?
The standard musical staff consists of five horizontal lines. When notes are too high or too low to fit within the staff, ledger lines are added to extend the range while keeping the notation easy to read.
Ledger lines are commonly used for instruments with a wide pitch range, especially the piano, where music often extends well beyond the limits of both the treble and bass clefs.
How are ledger lines used in piano playing?
Piano players encounter ledger lines frequently because the piano has an exceptionally wide range of notes. Reading them quickly is an essential skill for fluent sight-reading.
A useful landmark is middle C, which is written on a single ledger line below the treble staff and above the bass staff. Recognizing this reference note makes it much easier to identify surrounding notes.