pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6334-tunebook.ps) >>/Users/jc/w/tmp/Tune-6334-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_63342.log 259149 Log file, useful mostly for debugging
Coll_63345.log 259149 Log file, useful mostly for debugging
Coll_63347.log 142807 Log file, useful mostly for debugging
Form_63344.log 977 Log file, useful mostly for debugging
Tune-6334-get.log 4458 Log file, useful mostly for debugging
Tune-6334-tunebook.abc 515 ABC music file with the extracted tune(s)
Tune-6334-tunebook.ps 35004 PostScript
Tune-6334-tunebook.txt 515 Plain-text file with the extracted tune(s)
Tune-63344-get.log 3390 Log file, useful mostly for debugging
Tune-63349-get.log 4572 Log file, useful mostly for debugging
These files should be available for 24 hours.