pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4154-Petrie.ps) >>/Users/jc/w/tmp/Tune-4154-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/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
Tune-4154-Petrie.abc 270 ABC music file with the extracted tune(s)
Tune-4154-Petrie.ps 33832 PostScript
Tune-4154-Petrie.txt 270 Plain-text file with the extracted tune(s)
Tune-4154-get.log 4320 Log file, useful mostly for debugging
Tune-41542-get.log 4569 Log file, useful mostly for debugging
These files should be available for 24 hours.