LGTM thanks!
https://codereview.appspot.com/565610043/diff/559450051/lily/stem.cc File lily/stem.cc (right): https://codereview.appspot.com/565610043/diff/559450051/lily/stem.cc#newcode99 lily/stem.cc:99: // we confident that the list is short? Yes, I'm confident about that. // This list represents the vertical positions at which beams // start/end at this stem, so the O(N) cost of scm_ilength is // fine. https://codereview.appspot.com/565610043/
