pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5869-tunebook.ps) >>/Users/jc/w/tmp/Tune-5869-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_58693.log 247869 Log file, useful mostly for debugging
Form_58697.log 776 Log file, useful mostly for debugging
Tune-5869-get.log 7352 Log file, useful mostly for debugging
Tune-5869-tunebook.abc 854 ABC music file with the extracted tune(s)
Tune-5869-tunebook.ps 46114 PostScript
Tune-5869-tunebook.txt 854 Plain-text file with the extracted tune(s)
Tune-58694-get.log 3262 Log file, useful mostly for debugging
These files should be available for 24 hours.