Anyway, the point is that the MacOS X (Intel) 10.4 link on the LilyPond download site does indeed work, even if the binary is mislabelled. The situation with my MacBook running Leopard is more complicated. I have never once followed the MacOS X (Leopard) 10.5 link on the LilyPond download page. The link takes you away from the LilyPond site and has a bunch of instructions that have never made much sense to me. Happily, though, what does work for me is to download from the MacOS (G3, G4, G5 Macs) 10.3 and newer link on the LilyPond download page. Though not strictly necessary, bar checks should be used in the input code to show where bar lines are expected to fall. It seems like downloading a binary for the old, old type of Mac hardware would be exactly the wrong thing to do for a MacBook made of the (almost) newest type of Mac hardware. With bar checks, the program can verify that you’ve entered durations that make each measure add up to the correct length. Bar checks also make your input code easier. I think the one caveat here is that I never use the LilyPond GUI and always call LilyPond from the commandline. I think that running the LilyPond GUI on my MacBook with the old G3 version of the binary would probably fail.\override Staff.StaffSymbol.
