Extending LilyPond: 1.1.2 Scheme variables

### 1.1.2 Scheme variables

Scheme variables can have any valid scheme value, including a Scheme procedure.

Scheme variables are created with `define`:

    guile> (define a 2)
    guile>

Scheme variables can be evaluated at the guile prompt simply by typing the variable name:

    guile> a
    2
    guile>

Scheme variables can be printed on the display by using the display function:

    guile> (display a)
    2guile>

Note that both the value `2` and the guile prompt `guile` showed up on the same line. This can be avoided by calling the newline procedure or displaying a newline character.

    guile> (display a)(newline)
    2
    guile> (display a)(display "\n")
    2
    guile>

Once a variable has been created, its value can be changed with `set!`:

    guile> (set! a 12345)
    guile> a
    12345
    guile>

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#### LilyPond — Extending