Dear Mats, Bertalan and Graham, Flooded with and surprised by instant reactions, I've given the problem (or is it a bug?) some more thought. Two points of view are possible: 1. The Programmer's view. A measure of music, like any other object in programming, should have a unique number. No ambiguity is logically allowed or even thinkable. So, the first measure of the second piece section should be 18. 2. The Musician's view. Measure 16b (2a volta) is essentially/musically the same as measure 16a (1a volta). Moreover, this particular piece (bwv 1017) has not only a harsichord part but also a violin part. There, there is no distinction between 16a and 16b, and in the separate violon part there is no need to write it out that way at all. Would I indeed follow that choice when coding the violin part, I would end up with a difference in measure numbering which is rather awkward during rehearsals. So, the first measure of the second piece section should be 17 in both parts. Luckily enough, in the users reference I found the possibility to manually influence measure numbering (page 189 section 8.2.4) so to me the discussion has lost its practical relevance. Lilypond's programmers may or may not take one of the two views... Paul de Bruin.
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