Re: scheme problem in lilypond

[Mats Bengtsson]

> Hi,
> 
> I was wondering why this fails in a lilypond file:
> 
> (define speed 60)
> 
> ...
> 
> \midi { 
>     \tempo 4 = #speed 
> }
> 
> 
> I get this:
> 
> foo.ly:95:0: error: parse error, expecting `DIGIT' or `NUMBER_IDENTIFIER' or 
> `UNSIGNED' or `REAL':
> 
> 
> I can define and substitute strings with no problem, so why not numbers?
> Is there a workaround?

In the current Lilypond grammar (as defined by lily/parser.yy), 
the argument to the \tempo command bust be an unsigned integer
and cannot be specified by a Scheme value. The same holds for, 
for example, note durations. I agree that this may seem inconsistent
with the use of strings in the grammar. Why do you want to 
specify it in Scheme? If you wish, you could define a Lilypond 
identifier and use as the argument, though:

speed = 60;

\midi { 
    \tempo 4 = \speed
}

     /Mats