### A.2.1 Solo piano

Here is a simple piano staff with some notes.

>     upper = \relative c'' {
>       \clef treble
>       \key c \major
>       \time 4/4

>       a4 b c d
>     }

>     lower = \relative c {
>       \clef bass
>       \key c \major
>       \time 4/4

>       a2 c
>     }

>     \score {
>       \new PianoStaff <<
>         \set PianoStaff.instrumentName = #"Piano  "
>         \new Staff = "upper" \upper
>         \new Staff = "lower" \lower
>       >>
>       \layout { }
>       \midi { }
>     }

其他语言：español, français, italiano, 日本語, nederlands。
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