Dear community, I found out, that the changePitch Macro, developed by Gilles, http://lists.gnu.org/archive/html/lilypond-user/2009-11/msg00556.html
behaves sometimes a little bit strange, when it is used together with partcombine. Here is my snippet: \include "changePitch.ly" oben = { e''' 4. g''' gis''' 4 g'''4. r r 4 }
unten = {\changePitch \oben { g''4. bes'' c'''4 es'''4. } }