LilyPond 記譜法リファレンス: 5.1.5 Changing context default settings

### 5.1.5 Changing context default settings

The context settings which are to be used by default in `Score`, `Staff` and `Voice` contexts may be specified in a `\layout` block, as illustrated in the following example. The `\layout` block should be placed within the `\score` block to which it is to apply, but outside any music.

Note that the `\set` command itself and the context must be omitted when the context default values are specified in this way:

>     \score {
>       \relative c'' {
>         a4^"Really small, thicker stems, no time signature" a a a
>         a a a a
>       }
>       \layout {
>         \context {
>           \Staff
>           fontSize = #-4
>           \override Stem #'thickness = #4.0
>           \remove "Time_signature_engraver"
>         }
>       }
>     }

In this example, the `\Staff` command specifies that the subsequent specifications are to be applied to all staves within this score block.

Modifications can be made to the `Score` context or all `Voice` contexts in a similar way.

#### 既知の問題と警告

It is not possible to collect context changes in a variable and apply them to a `\context` definition by referring to that variable.

The `\Staff \RemoveEmptyStaves` will overwrite your current `\Staff` settings. If you wish to change the defaults for a staff which uses `\Staff \RemoveEmptyStaves`, you must do so after calling `\Staff \RemoveEmptyStaves`, ie

>     \layout {
>       \context {
>         \Staff \RemoveEmptyStaves

>         \override Stem #'thickness = #4.0
>       }
>     }

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