Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1772/JamesJohnson_ScotsMusicalMuseumV4-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-88692-JamesJohnson_ScotsMusicalMuseumV4-V2.ps) >>/Users/jc/w/tmp/Tune-88692-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1772/JamesJohnson_ScotsMusicalMuseumV4-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-88692-20641_Poor_Joe_the_Marine.abc 619 ABC music file with the extracted tune(s)
Tune-88692-20641_Poor_Joe_the_Marine.pdf 16914 Portable Data Format
Tune-88692-20641_Poor_Joe_the_Marine.ps 36379 PostScript
Tune-88692-20641_Poor_Joe_the_Marine.txt 619 Plain-text file with the extracted tune(s)
Tune-88692-JamesJohnson_ScotsMusicalMuseumV4-V2.abc 173 ABC music file with the extracted tune(s)
Tune-88692-JamesJohnson_ScotsMusicalMuseumV4-V2.ps 6 PostScript
Tune-88692-JamesJohnson_ScotsMusicalMuseumV4-V2.txt 173 Plain-text file with the extracted tune(s)
Tune-88692-get.log 10393 Log file, useful mostly for debugging
These files should be available for 24 hours.