### 3.1.1 Structure of a score

A `\score` block must contain a single music expression delimited by curly brackets:

>     \score {
>       …
>     }

Note: There must be only one outer music expression in a `score` block, and it must be surrounded by curly brackets.

This single music expression may be of any size, and may contain other music expressions to any complexity. All of these examples are music expressions:

>     { c'4 c' c' c' }

>     {
>       { c'4 c' c' c' }
>       { d'4 d' d' d' }
>     }

>     <<
>       \new Staff { c'4 c' c' c' }
>       \new Staff { d'4 d' d' d' }
>     >>

>     {
>       \new GrandStaff <<
>         \new StaffGroup <<
>           \new Staff { \flute }
>           \new Staff { \oboe }
>         >>
>         \new StaffGroup <<
>           \new Staff { \violinI }
>           \new Staff { \violinII }
>         >>
>       >>
>     }

Comments are one exception to this general rule. (For others see File structure.) Both single-line comments and comments delimited by `%{ … %}` may be placed anywhere within an input file. They may be placed inside or outside a `\score` block, and inside or outside the single music expression within a `\score` block.

Remember that even in a file containing only a `\score` block, it is implicitly enclosed in a \book block. A \book block in a source file produces at least one output file, and by default the name of the output file produced is derived from the name of the input file, so ‘`fandangoforelephants.ly`’ will produce ‘`fandangoforelephants.pdf`’.

(For more details about `\book` blocks, see Multiple scores in a book, Multiple output files from one input file File structure.)

#### See also

Learning Manual: Working on input files, Music expressions explained, Score is a (single) compound musical expression.

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