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
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