LilyPond 学习手册: 3.1.6 Automatic and manual beams

### 3.1.6 Automatic and manual beams

Music Glossary: beam.

All beams are drawn automatically:

>     \relative { a'8 ais d ees r d c16 b a8 }

If you do not like the automatic beams, they may be overridden manually. To correct just an occasional beam mark the first note to be beamed with ‘`[`’ and the last one with ‘`]`’. Note that ‘`[`’ comes after the first beamed note.

>     \relative { a'8[ ais] d[ ees r d] c16 b a8 }

If you want to turn off automatic beaming entirely or for an extended section of music, use the command `\autoBeamOff` to turn off automatic beaming and `\autoBeamOn` to turn it on again.

>     \relative {
>       \autoBeamOff
>       a'8 c b4 d8. c16 b4 |
>       \autoBeamOn
>       a8 c b4 d8. c16 b4 |
>     }

#### 参见

Notation Reference: Automatic beams, Manual beams.

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