Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/21302_Highland_King.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-964-all.ps) >>/Users/jc/w/tmp/Tune-964-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/21302_Highland_King.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-964-all.abc 171 ABC music file with the extracted tune(s)
Tune-964-all.ps 6 PostScript
Tune-964-all.txt 171 Plain-text file with the extracted tune(s)
Tune-964-get.log 4042 Log file, useful mostly for debugging
Tune-96402-all.abc 173 ABC music file with the extracted tune(s)
Tune-96402-all.ps 6 PostScript
Tune-96402-all.txt 173 Plain-text file with the extracted tune(s)
Tune-96402-get.log 4002 Log file, useful mostly for debugging
Tune-96417-all.abc 174 ABC music file with the extracted tune(s)
Tune-96417-all.pdf 2217 Portable Data Format
Tune-96417-all.ps 6 PostScript
Tune-96417-all.txt 174 Plain-text file with the extracted tune(s)
Tune-96417-get.log 4957 Log file, useful mostly for debugging
Tune-96435-all.abc 176 ABC music file with the extracted tune(s)
Tune-96435-all.ps 6 PostScript
Tune-96435-all.txt 176 Plain-text file with the extracted tune(s)
Tune-96435-get.log 4137 Log file, useful mostly for debugging
Tune-96498-all.abc 178 ABC music file with the extracted tune(s)
Tune-96498-all.ps 6 PostScript
Tune-96498-all.txt 178 Plain-text file with the extracted tune(s)
Tune-96498-get.log 4032 Log file, useful mostly for debugging
These files should be available for 24 hours.