How many ledger lines can notes go above and below the treble and bass staff?

In music notation, ledger lines are used to notate pitches that fall outside the standard range of the treble and bass staffs. For both the treble and bass clefs, notes can extend upwards and downwards using these lines.

Specifically, it is standard practice to have up to four ledger lines above or below the staff. This allows musicians to read notes that are significantly higher or lower than what is traditionally represented by the staff. For instance, in the treble clef, up to four ledger lines can indicate notes that would extend beyond the highest note typically available on the staff, while similarly, notes below the bass clef can also utilize this same number of lines.

The correct answer highlights this convention in music notation, confirming that the range for pitches can indeed span four ledger lines above or below each clef. This is particularly vital for composers and musicians who need to accurately represent a wide variety of pitches.