pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3644-4182-Duncan_Gray-abc1.ps) >>/Users/jc/w/tmp/Tune-3644-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/4182-Duncan_Gray-abc1.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_36442.log 1154025 Log file, useful mostly for debugging
Coll_36443.log 1301551 Log file, useful mostly for debugging
Coll_36444.log 1848619 Log file, useful mostly for debugging
Coll_36447.log 299788 Log file, useful mostly for debugging
Form_36441.log 876 Log file, useful mostly for debugging
Tune-3644-4182-Duncan_Gray-abc1.abc 1444 ABC music file with the extracted tune(s)
Tune-3644-4182-Duncan_Gray-abc1.ps 46597 PostScript
Tune-3644-4182-Duncan_Gray-abc1.txt 1444 Plain-text file with the extracted tune(s)
Tune-3644-get.log 5982 Log file, useful mostly for debugging
Tune-36441-get.log 9312 Log file, useful mostly for debugging
Tune-36445-get.log 5249 Log file, useful mostly for debugging
Tune-36447-get.log 3911 Log file, useful mostly for debugging
Tune-36448-get.log 3854 Log file, useful mostly for debugging
These files should be available for 24 hours.