It looks like noweb parsing has very recently become very brittle, since it broke the noweb in my lilypond example. This does not appear to be restricted to lilypond blocks. The error is (wrong-type-argument consp nil) I fixed for my songs by changing... #+srcname: gen_arpeggio(key,root) to... #+srcname: gen_arpeggio (key,root) and... <> to... <> I believe #+call: is affected too. Unfortunately I won't be able to investigate further until next week. Regards Martyn