pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9353-SpeedThePlough.ps) >>/Users/jc/w/tmp/Tune-9353-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/gregdahms.ca/Tunes/SpeedThePlough.abc:/%1:SPEEDTHEPLOUGH

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_9353.log 277899 Log file, useful mostly for debugging
Coll_93533.log 269559 Log file, useful mostly for debugging
Coll_93534.log 135658 Log file, useful mostly for debugging
Tune-9353-SpeedThePlough.abc 395 ABC music file with the extracted tune(s)
Tune-9353-SpeedThePlough.ps 36387 PostScript
Tune-9353-SpeedThePlough.txt 395 Plain-text file with the extracted tune(s)
Tune-9353-get.log 5092 Log file, useful mostly for debugging
Tune-93532-ABC.abc 0 ABC music file with the extracted tune(s)
Tune-93532-ABC.txt 0 Plain-text file with the extracted tune(s)
Tune-93532-get.log 584250 Log file, useful mostly for debugging
Tune-93534-get.log 1400 Log file, useful mostly for debugging
Tune-93535-get.log 9138 Log file, useful mostly for debugging
Tune-93538-get.log 5137 Log file, useful mostly for debugging
Tune-93539-get.log 9637 Log file, useful mostly for debugging
These files should be available for 24 hours.