backend. Fixme.
*/
+/*
+ TODO:
+
+ shared lyrics should be vertically centered:
+
+
+
+> About lyrics, it happens that there are common words for many bars, like
+> for a refrain say. When there is an even number of lyrics lines, I do not
+> know how to force the positioning of the common lyric line in the plain
+> middle of the others, because this is in between lines. Not a big matter,
+> but it would be a bit nicer if this was doable.
+
+ */
/*
We find start and end of phrases, and align lyrics accordingly.