Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/20361_the_Wars_Alarms.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2339-all.ps) >>/Users/jc/w/tmp/Tune-2339-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/20361_the_Wars_Alarms.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-2339-all.abc 173 ABC music file with the extracted tune(s)
Tune-2339-all.ps 6 PostScript
Tune-2339-all.txt 173 Plain-text file with the extracted tune(s)
Tune-2339-get.log 7962 Log file, useful mostly for debugging
Tune-23390-10632_Cease_Your_Funning.abc 623 ABC music file with the extracted tune(s)
Tune-23390-10632_Cease_Your_Funning.ps 34047 PostScript
Tune-23390-10632_Cease_Your_Funning.txt 623 Plain-text file with the extracted tune(s)
Tune-23390-get.log 4731 Log file, useful mostly for debugging
These files should be available for 24 hours.