LGTM. Very nice, thanks! Some minor nits only.
https://codereview.appspot.com/557500043/diff/551490044/Documentation/changes.tely File Documentation/changes.tely (right): https://codereview.appspot.com/557500043/diff/551490044/Documentation/changes.tely#newcode67 Documentation/changes.tely:67: @emph{exactly} behaves like standard (i.e. default) beaming in every respect s/i.e./i.e.,/ https://codereview.appspot.com/557500043/diff/551490044/Documentation/changes.tely#newcode68 Documentation/changes.tely:68: (beam positioning and placement of any articulation/fingering/etc.). The ... articulation, fingering, etc. https://codereview.appspot.com/557500043/diff/551490044/Documentation/changes.tely#newcode69 Documentation/changes.tely:69: only remaining difference being inner stems not passing through beams. s/being/are/ https://codereview.appspot.com/557500043/diff/551490044/input/regression/beam-french.ly File input/regression/beam-french.ly (right): https://codereview.appspot.com/557500043/diff/551490044/input/regression/beam-french.ly#newcode23 input/regression/beam-french.ly:23: { d32[^1 e^2 f^3 g^4 a^5] } s64 Please add one or more test cases for your 'french-correction' property. https://codereview.appspot.com/557500043/