Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-59319-JohnJohnson_ChoiceCollectionVol8-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-79662-Tune-59319-JohnJohnson_ChoiceCollectionVol8-V1.ps) >>/Users/jc/w/tmp/Tune-79662-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-59319-JohnJohnson_ChoiceCollectionVol8-V1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Find_79662.log 1378 Log file, useful mostly for debugging
Tune-79662-Tune-59319-JohnJohnson_ChoiceCollectionVol8-V1.abc 198 ABC music file with the extracted tune(s)
Tune-79662-Tune-59319-JohnJohnson_ChoiceCollectionVol8-V1.ps 6 PostScript
Tune-79662-Tune-59319-JohnJohnson_ChoiceCollectionVol8-V1.txt 198 Plain-text file with the extracted tune(s)
Tune-79662-get.log 8961 Log file, useful mostly for debugging
These files should be available for 24 hours.