Re: Issue 2083 in lilypond: \\break in alternative causes score to split

[Eluze]

this is described in  
http://lilypond.org/doc/v2.15/Documentation/usage/common-errors#Common-errors

it points to the fact that there are "… two \relative blocks, which each
implicitly create Staff and Voice blocks."

the following example creates a separate staff, too:

{
    \relative c' c
    \relative c' d
}

if in your example you only use \music once everything looks OK!

Eluze