Thanks everyone I've now got it up and running! And thanks for the alternate script, Jacques.
After down-loading the entire package from the the GitHub site I now see the .ily files are executables - copy and paste as text file isn't going to work. Once I had the lily jazz package downloaded, drag and drop into the correct directories works nicely.
My mistake was in trying to download individual files from GitHub... it's much easier than that!
So, to help out any more hapless wanderers out there, here's the complete download and installation process i used:
First find the lily jazz files package:
go here -
you'll see this:
You don't need to select anything, just hit the "clone or download" button, then "download ZIP", you''ll get the lilyjazz-Master folder with the following contents:
The files in the otf folder go in the /otf directory in your LilyPond application.
" " stylesheet " " /ly " " " .
" " supplementary /otf " " " .
" " svg /svg " " " .
I put everything in the lilyjazz-Master folders in the indicated directories: text, executables; whatever was there. Everything outside these 4 folders is apparently reference.
So where do you find the LilyPond application directories? ... depends on your operating system. I'm using a Mac.
I found the directory paths by looking at the search path in the LilyPond compiler log file of a failed lilyjazz script, i.e., before I had everything in its' proper place. This log file pops up automatically when you select >COMPILE >TYPESET FILE from the LilyPond menu bar:
The script which produced this output is included in the email thread above.
Check out the "examples" folder; a lot of the code needed for a basic lead sheet is already done for you in the .ly files included there.
And thanks again everyone for your help.
Best,
Jeff