pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6023-tunebook.ps) >>/Users/jc/w/tmp/Tune-6023-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
Coll_60238.log 141597 Log file, useful mostly for debugging
Coll_60239.log 271839 Log file, useful mostly for debugging
Form_60239.log 0 Log file, useful mostly for debugging
Tune-6023-get.log 333 Log file, useful mostly for debugging
Tune-6023-tunebook.abc 0 ABC music file with the extracted tune(s)
Tune-6023-tunebook.ps 0 PostScript
Tune-6023-tunebook.txt 0 Plain-text file with the extracted tune(s)
Tune-60234-get.log 3060 Log file, useful mostly for debugging
Tune-60235-get.log 7139 Log file, useful mostly for debugging
Tune-60239-get.log 3143 Log file, useful mostly for debugging
These files should be available for 24 hours.