Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/waifs/JohnJohnson_ChoiceCollectionVol8-VMP.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3489-JohnJohnson_ChoiceCollectionVol8-VMP.ps) >>/Users/jc/w/tmp/Tune-3489-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/waifs/JohnJohnson_ChoiceCollectionVol8-VMP.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_34892.log 464011 Log file, useful mostly for debugging
Coll_34893.log 478010 Log file, useful mostly for debugging
Coll_34895.log 471007 Log file, useful mostly for debugging
Coll_34899.log 1172228 Log file, useful mostly for debugging
Tune-3489-JohnJohnson_ChoiceCollectionVol8-VMP.abc 174 ABC music file with the extracted tune(s)
Tune-3489-JohnJohnson_ChoiceCollectionVol8-VMP.ps 6 PostScript
Tune-3489-JohnJohnson_ChoiceCollectionVol8-VMP.txt 174 Plain-text file with the extracted tune(s)
Tune-3489-get.log 4616 Log file, useful mostly for debugging
Tune-34892-get.log 6119 Log file, useful mostly for debugging
Tune-34898-get.log 7347 Log file, useful mostly for debugging
These files should be available for 24 hours.