Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/21290_.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9339-all.ps) >>/Users/jc/w/tmp/Tune-9339-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/21290_.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-9339-30511_Dance-001.svg 17286 Scalable Vector Graphics format
Tune-9339-30511_Dance.abc 728 ABC music file with the extracted tune(s)
Tune-9339-30511_Dance.txt 728 Plain-text file with the extracted tune(s)
Tune-9339-all.abc 158 ABC music file with the extracted tune(s)
Tune-9339-all.ps 6 PostScript
Tune-9339-all.txt 158 Plain-text file with the extracted tune(s)
Tune-9339-get.log 8155 Log file, useful mostly for debugging
Tune-93392-30733_Walkers_Hornpipe.abc 675 ABC music file with the extracted tune(s)
Tune-93392-30733_Walkers_Hornpipe.txt 675 Plain-text file with the extracted tune(s)
Tune-93392-get.log 3572 Log file, useful mostly for debugging
Tune-93397-get.log 3752 Log file, useful mostly for debugging
Tune-93397-slurs.abc 30 ABC music file with the extracted tune(s)
Tune-93397-slurs.ps 6 PostScript
Tune-93397-slurs.txt 30 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.