pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2709-tunebook.ps) >>/Users/jc/w/tmp/Tune-2709-get.log 2>&1" returned status 256
http://richardrobinson.tunebook.org.uk/data/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
Form_27099.log 0 Log file, useful mostly for debugging
Tune-2709-get.log 4471 Log file, useful mostly for debugging
Tune-2709-tunebook.abc 227 ABC music file with the extracted tune(s)
Tune-2709-tunebook.ps 32567 PostScript
Tune-2709-tunebook.txt 227 Plain-text file with the extracted tune(s)
Tune-27091-get.log 8927 Log file, useful mostly for debugging
Tune-27093-get.log 0 Log file, useful mostly for debugging
Tune-27094-get.log 5368 Log file, useful mostly for debugging
These files should be available for 24 hours.