pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-70042-tunebook.ps) >>/Users/jc/w/tmp/Tune-70042-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
Tune-70042-get.log 4386 Log file, useful mostly for debugging
Tune-70042-tunebook.abc 611 ABC music file with the extracted tune(s)
Tune-70042-tunebook.ps 36957 PostScript
Tune-70042-tunebook.txt 611 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.