Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1792/JohnJohnson_ChoiceCollectionVol8-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4324-JohnJohnson_ChoiceCollectionVol8-V1.ps) >>/Users/jc/w/tmp/Tune-4324-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1792/JohnJohnson_ChoiceCollectionVol8-V1.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-4324-JohnJohnson_ChoiceCollectionVol8-V1.abc 172 ABC music file with the extracted tune(s)
Tune-4324-JohnJohnson_ChoiceCollectionVol8-V1.ps 6 PostScript
Tune-4324-JohnJohnson_ChoiceCollectionVol8-V1.txt 172 Plain-text file with the extracted tune(s)
Tune-4324-get.log 12734 Log file, useful mostly for debugging
Tune-43240-get.log 5362 Log file, useful mostly for debugging
Tune-43241-get.log 12586 Log file, useful mostly for debugging
Tune-43245-get.log 3564 Log file, useful mostly for debugging
Tune-43247-get.log 9973 Log file, useful mostly for debugging
Tune-43249-get.log 16253 Log file, useful mostly for debugging
These files should be available for 24 hours.