Page break in *.ex-files

[Petr Felzmann]

Hello,

in LaTeX I have setting the size of page on A6 (105mm x 148.5mm). In
every *.mtx-file in preamble I have

PMX: w85m h128.5m

In LaTeX document I include *.ex-files, which I obtain from mtx-source:

\begin{mus}
\input song1.ex
\end{mus}

But the page break don't make inside the songs. The songs have behavior
like floating environments. How TeX coerce to page break if it is
needed?

Thank you,
Petr Felzmann.