Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/13122_Widow_are_you_wakeing.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7833-all.ps) >>/Users/jc/w/tmp/Tune-7833-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/13122_Widow_are_you_wakeing.abc/all

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-7833-all.abc 179 ABC music file with the extracted tune(s)
Tune-7833-all.ps 6 PostScript
Tune-7833-all.txt 179 Plain-text file with the extracted tune(s)
Tune-7833-get.log 4107 Log file, useful mostly for debugging
Tune-78333-1771.abc 150 ABC music file with the extracted tune(s)
Tune-78333-1771.txt 150 Plain-text file with the extracted tune(s)
Tune-78333-get.log 2722 Log file, useful mostly for debugging
These files should be available for 24 hours.