pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6466-petrie.ps) >>/Users/jc/w/tmp/Tune-6466-get.log 2>&1" returned status 256
http://nigelgatherer.com/tunes/abc/petrie/petrie.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_64662.log 262102 Log file, useful mostly for debugging
Form_64663.log 1131 Log file, useful mostly for debugging
Tune-6466-get.log 4293 Log file, useful mostly for debugging
Tune-6466-petrie.abc 480 ABC music file with the extracted tune(s)
Tune-6466-petrie.ps 36643 PostScript
Tune-6466-petrie.txt 480 Plain-text file with the extracted tune(s)
Tune-64667-get.log 5532 Log file, useful mostly for debugging
Tune-64669-get.log 4294 Log file, useful mostly for debugging
These files should be available for 24 hours.