pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-20901-tunebook.ps) >>/Users/jc/w/tmp/Tune-20901-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/tunebook.org.uk/tunebook.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-20901-get.log 4754 Log file, useful mostly for debugging
Tune-20901-tunebook.abc 1131 ABC music file with the extracted tune(s)
Tune-20901-tunebook.ps 36325 PostScript
Tune-20901-tunebook.txt 1131 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.