Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/CCCCD2/JamesJohnson_ScotsMusicalMuseumV5-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4755-JamesJohnson_ScotsMusicalMuseumV5-V2.ps) >>/Users/jc/w/tmp/Tune-4755-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CCCCD2/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-4755-JamesJohnson_ScotsMusicalMuseumV5-V2.abc 175 ABC music file with the extracted tune(s)
Tune-4755-JamesJohnson_ScotsMusicalMuseumV5-V2.ps 6 PostScript
Tune-4755-JamesJohnson_ScotsMusicalMuseumV5-V2.txt 175 Plain-text file with the extracted tune(s)
Tune-4755-get.log 10045 Log file, useful mostly for debugging
Tune-47550-get.log 8845 Log file, useful mostly for debugging
Tune-47552-get.log 3232 Log file, useful mostly for debugging
Tune-47553-get.log 8571 Log file, useful mostly for debugging
Tune-47555-get.log 4241 Log file, useful mostly for debugging
Tune-47559-get.log 3314 Log file, useful mostly for debugging
These files should be available for 24 hours.