pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4287-B18.ps) >>/Users/jc/w/tmp/Tune-4287-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/AnselmLingnau/sets/B18.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-4287-B18.abc 624 ABC music file with the extracted tune(s)
Tune-4287-B18.ps 39766 PostScript
Tune-4287-B18.txt 624 Plain-text file with the extracted tune(s)
Tune-4287-get.log 4291 Log file, useful mostly for debugging
These files should be available for 24 hours.