From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Arntson <steven@stevenarntson.com>
Subject: Re: where Babel looks for binaries?
Date: Sun, 17 Aug 2014 10:16:25 -0700
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Achim Gratz <Stromeko@nexgo.de> writes:

> Steven Arntson writes:
>> I reverted the change to ob-lilypond.el and did as you suggested, adding
>>
>> (setq ly-nix-ly-path "/usr/local/lilypond")
>
> I don't think that path points to an actual lilypond executable, but is
> rather an installation directory.  Since it would seem you have lilypond
> in PATH on your system, you might rather try just "lilypond" (or check
> which lilypond you're actually using by doing a "which lilypond" on the
> command line).
>
> Regards,
> Achim.

That did it---I changed my init.el to read:

(setq ly-nix-ly-path "lilypond")

And it works like a charm.

Thank you!
steven