Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1748/JamesJohnson_ScotsMusicalMuseumV5-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2957-JamesJohnson_ScotsMusicalMuseumV5-V2.ps) >>/Users/jc/w/tmp/Tune-2957-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1748/JamesJohnson_ScotsMusicalMuseumV5-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-2957-JamesJohnson_ScotsMusicalMuseumV5-V2.abc 173 ABC music file with the extracted tune(s)
Tune-2957-JamesJohnson_ScotsMusicalMuseumV5-V2.ps 6 PostScript
Tune-2957-JamesJohnson_ScotsMusicalMuseumV5-V2.txt 173 Plain-text file with the extracted tune(s)
Tune-2957-get.log 4610 Log file, useful mostly for debugging
Tune-29574-get.log 4392 Log file, useful mostly for debugging
Tune-29576-IaST-abc2.abc 146 ABC music file with the extracted tune(s)
Tune-29576-IaST-abc2.txt 146 Plain-text file with the extracted tune(s)
Tune-29576-get.log 3170 Log file, useful mostly for debugging
Tune-29578-24FavouriteDances_1783_Straight.abc 168 ABC music file with the extracted tune(s)
Tune-29578-24FavouriteDances_1783_Straight.ps 6 PostScript
Tune-29578-24FavouriteDances_1783_Straight.txt 168 Plain-text file with the extracted tune(s)
Tune-29578-get.log 4557 Log file, useful mostly for debugging
These files should be available for 24 hours.