Paul,
can read up on them in the Guile manual). Here's the section on equality (eq? eqv? and equal?): https://www.gnu.org/software/guile/manual/guile.html#Equality I've found the guile manual to be a helpful resource for learning to use Scheme. Yes, I usually refer to the Guile manual although I try it only in Friscobaldi. I found the videos on youtube series http://www.youtube.com/watch? v=byofGyW2L10 [1-5] to be pretty good although his videos 6-7 are a bit confusing. The best help of all seems to be the display command that David showed. I wish they give a little more prominence to it in the manuals and tutorials. Jay _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user