### 3.10 Piano music

Piano staves are two normal staves coupled with a brace. The staves are largely independent, but sometimes voices can cross between the two staves. The same notation is also used for harps and other key instruments. The PianoStaff is especially built to handle this cross-staffing behavior. In this section we discuss the PianoStaff and some other pianistic peculiarities.

##### Bugs

There is no support for putting chords across staves. You can get this result by increasing the length of the stem in the lower stave so it reaches the stem in the upper stave, or vice versa. An example is included with the distribution as input/test/stem-cross-staff.ly.

Dynamics are not centered, but kludges do exist. See input/template/piano-dynamics.ly.

The distance between the two staves is normally fixed across the entire score. It is possible to tune this per system, but it does require arcane command incantations. See input/test/piano-staff-distance.ly.

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