Huge thanks to Timothy Lanfear! That solution works perfectly.
I can pass multiple parameters in like this:
lilypond -e '(define-public title "my song")(define-public
copyrightyear "2017")(define-public ismn "12345-678-90-5")' tmp.ly
and then my header looks like:
\header {
copyrightyear = \copyrightyear
title = \title
ismn = \ismn
}
It only works if the Guile module is added...
#(use-modules (guile-user))
Cheers!
Ian
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