-\version "1.9.0"
+\version "2.2.0"
%If you specify two different key sigs at one point, a
%warning is printed.
\score { \notes
-\context Voice <
+\context Voice <<
{ \key cis \major cis4 \key bes \major bes4 }
{ \key cis \major fis4 \key es \major g4 }
->
+>>
}