Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/21021_Lauchlans_Lilt.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1516-all.ps) >>/Users/jc/w/tmp/Tune-1516-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/21021_Lauchlans_Lilt.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
Coll_15164.log 448611 Log file, useful mostly for debugging
Form_15163.log 958 Log file, useful mostly for debugging
Tune-1516-all.abc 172 ABC music file with the extracted tune(s)
Tune-1516-all.ps 6 PostScript
Tune-1516-all.txt 172 Plain-text file with the extracted tune(s)
Tune-1516-get.log 4067 Log file, useful mostly for debugging
Tune-15164-get.log 4765 Log file, useful mostly for debugging
Tune-15168-get.log 1433 Log file, useful mostly for debugging
Tune-15169-get.log 1316 Log file, useful mostly for debugging
These files should be available for 24 hours.