pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3840-tunebook.ps) >>/Users/jc/w/tmp/Tune-3840-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
Find_3840.log 1743 Log file, useful mostly for debugging
Form_38407.log 855 Log file, useful mostly for debugging
Tune-3840-get.log 5772 Log file, useful mostly for debugging
Tune-3840-tunebook.abc 601 ABC music file with the extracted tune(s)
Tune-3840-tunebook.ps 37596 PostScript
Tune-3840-tunebook.txt 601 Plain-text file with the extracted tune(s)
Tune-38400-get.log 41992 Log file, useful mostly for debugging
Tune-38402-get.log 3103 Log file, useful mostly for debugging
Tune-38403-get.log 8189 Log file, useful mostly for debugging
Tune-38409-get.log 5118 Log file, useful mostly for debugging
These files should be available for 24 hours.