It's perhaps one of the confusing things in LilyPond that it engraves only
the staves that you create. By convention, a piano staff has two staves,
*but those staves don't exist unless you make them*.
A PianoStaff is a staff group (container for staves) with specific
properties: left brace, keep-alive-together. By default, it contains zero
staves. You may create only one staff in it, if you like.
That's different from Sibelius, e.g., which creates two staves for piano by
default.
Is that the question? It's really not clear... have you tried creating a
single-staff piano score and run into specific problems? If not, I suspect
you'll have less difficulty than you may be anticipating.
hjh
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