pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-72286-tunebook.abc -F fmt/pdf_60.fmt +s 0.60 +maxs 2000 )>/Users/jc/w/tmp/Tune-72286-tunebook.ps 2>>/Users/jc/w/tmp/Tune-72286-get.log" returned status 34304.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-72286-tunebook.ps) >>/Users/jc/w/tmp/Tune-72286-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_72286.log 819 Log file, useful mostly for debugging
Tune-72286-get.log 5581 Log file, useful mostly for debugging
Tune-72286-tunebook.abc 833 ABC music file with the extracted tune(s)
Tune-72286-tunebook.ps 0 PostScript
Tune-72286-tunebook.txt 833 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.