From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thorsten Jolitz <tjolitz@gmail.com>
Subject: Re: where Babel looks for binaries?
Date: Sun, 17 Aug 2014 03:30:46 +0200
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Steven Arntson <steven@stevenarntson.com> writes:

>> I would say try the above, i.e. restore ob-lilypond.el and set the
>> variable in you init file. Alternatively you could delete the
>> ob-lilypond.elc and the do M-x byte-compile-file on the modified
>> ob-lilypond.el, but I would not recommend mess around in libraries for
>> customizations. 
>
> I reverted the change to ob-lilypond.el and did as you suggested, adding
>
> (setq ly-nix-ly-path "/usr/local/lilypond")
>
> It's now looking in the right place, but still won't tangle the file
> when I run ly-tangle. The message in the minibuffer is:
>
> ly-compile-lilyfile: Searching for program: resource temporarily
> unavailable, /usr/local/lilypond
>
> The use of "temporarily" is certainly intriguing! I quit out of emacs
> and restarted, but am still getting the message.

hmm ... does it work without emacs?
did you try to use lilypond from the commandline?

-- 
cheers,
Thorsten