Horizontal scaling of scores

[Robert Schmaus]

Dear Lilyponders,

I'm working on a score and having trouble with the following (probably
not very difficult) issue, which I cannot solve despite having RTFM:

The problem is the height of the full score which contains all
instruments, and which I'd like to print in landscape mode. What I'm
looking for is a layout which basically follows along those lines:

1) How much vertical space is there? (E.g. 15cm.)
2) How much does the score in full (and nicely spaced) size have to be
scaled, s.t. it vertically fits on the page? (E.g. 57%)
3) Now produce the layout for a page, that is stretched by 1/.57
horizontally, then scale the whole thing with 57% and put that on the page.

What's happening right now is that, if space becomes too small, the
space between the staffs is reduced while the notes themselves stay in
their size, s.t. the staffs are just being "pushed into each other".

I'm sure there is a simple answer to that, but what is it? I've provided
an (almost) minimal example below.

Thanks in advance,
Robert


\version "2.14.1"

Opus = { \new Staff { c c' c'' } }

\paper{
        #(set-paper-size "a4" 'landscape)             
}

\score {

        <<
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
                \Opus
        >>

        \layout{}

}