Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/14329_FINE.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3236-all.ps) >>/Users/jc/w/tmp/Tune-3236-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/14329_FINE.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
List32367.log 160 Log file, useful mostly for debugging
Tune-3236-all.abc 162 ABC music file with the extracted tune(s)
Tune-3236-all.ps 6 PostScript
Tune-3236-all.txt 162 Plain-text file with the extracted tune(s)
Tune-3236-get.log 4003 Log file, useful mostly for debugging
Tune-32363-Bobbing_Joe-001.svg 8460 Scalable Vector Graphics format
Tune-32363-Bobbing_Joe.abc 201 ABC music file with the extracted tune(s)
Tune-32363-Bobbing_Joe.txt 201 Plain-text file with the extracted tune(s)
Tune-32363-get.log 4046 Log file, useful mostly for debugging
These files should be available for 24 hours.