Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/13222_Saw_ye_my_Peggy.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-88638-all.ps) >>/Users/jc/w/tmp/Tune-88638-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/13222_Saw_ye_my_Peggy.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-88638-MichaelmasEve_PLFD1687_279.abc 411 ABC music file with the extracted tune(s)
Tune-88638-MichaelmasEve_PLFD1687_279.ps 34362 PostScript
Tune-88638-MichaelmasEve_PLFD1687_279.txt 411 Plain-text file with the extracted tune(s)
Tune-88638-all.abc 173 ABC music file with the extracted tune(s)
Tune-88638-all.ps 6 PostScript
Tune-88638-all.txt 173 Plain-text file with the extracted tune(s)
Tune-88638-get.log 8996 Log file, useful mostly for debugging
These files should be available for 24 hours.