Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1748/JohnJohnson_ChoiceCollectionVol8-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4563-JohnJohnson_ChoiceCollectionVol8-V2.ps) >>/Users/jc/w/tmp/Tune-4563-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1748/JohnJohnson_ChoiceCollectionVol8-V2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-4563-JohnJohnson_ChoiceCollectionVol8-V2.abc 172 ABC music file with the extracted tune(s)
Tune-4563-JohnJohnson_ChoiceCollectionVol8-V2.ps 6 PostScript
Tune-4563-JohnJohnson_ChoiceCollectionVol8-V2.txt 172 Plain-text file with the extracted tune(s)
Tune-4563-get.log 4593 Log file, useful mostly for debugging
Tune-45630-get.log 8039 Log file, useful mostly for debugging
Tune-45632-get.log 9435 Log file, useful mostly for debugging
Tune-45636-get.log 7698 Log file, useful mostly for debugging
Tune-45637-get.log 4102 Log file, useful mostly for debugging
Tune-45639-get.log 13258 Log file, useful mostly for debugging
These files should be available for 24 hours.