Several systems have a four-line staff alternating with two adjacent
ledger lines. They are similar to the five-line staves (above), but they
are slightly less visually dense (or “busy”), and require
more ledger lines. They are also less likely to be confused with
traditional notation. One system goes further with only three lines that
alternate with three ledger lines per octave. Signs such as dynamic
markings can be written in the space created by the ledger lines, even
when multiple staves are stacked contiguously.