I'm making some changes to the auto-beaming rules to take full advantage of
beatGrouping wherever possible, since this will make the default beaming
much easier to override. I'd like to be sure LilyPond follows standard
beaming practice (in so far as it is defined) wrt beat grouping as far as
possible. As I don't have access to Gardner Read or any other definitive
book on engraving could someone who has please let me know what Read or any
other authority has to say about this.