### 3.6.1 Displaying LilyPond notation

Displaying a music expression in LilyPond notation can be done with the music function `\displayLilyMusic`. To see the output, you will typically want to call LilyPond using the command line. For example,

>     {
>       \displayLilyMusic \transpose c a, { c4 e g a bes }
>     }

will display

>     { a,4 cis e fis g }

By default, LilyPond will print these messages to the console along with all the other LilyPond compilation messages. To split up these messages and save the results of `\displayLilyMusic`, redirect the output to a file.

>     lilypond file.ly >display.txt

Note that Lilypond does not just display the music expression, but also interprets it (since `\displayLilyMusic` returns it in addition to displaying it). This is convenient since you can just insert `\displayLilyMusic` into existing music in order to get information about it. If you don’t actually want Lilypond to interpret the displayed music as well as display it, use `\void` in order to have it ignored:

>     {
>       \void \displayLilyMusic \transpose c a, { c4 e g a bes }
>     }

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#### LilyPond — Notation Reference v2.18.2 (稳定分支).