Making all fonts smaller

[John Goerzen]

Hi,

I have music that I wish to fit on a single page.  An obvious way to
start is to reduce the font size globally.  However, I can find no
easy way to do this.  I'm a relative beginner at lilypond and can't
seem to figure out how to apply a font-relative-size setting
globally.  Can anybody assist?

Thanks!

-- John