pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4939-ABC.ps) >>/Users/jc/w/tmp/Tune-4939-get.log 2>&1" returned status 256
http://www.colinhume.com/ABC.txt

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_49399.log 143412 Log file, useful mostly for debugging
Form_49390.log 894 Log file, useful mostly for debugging
Form_49392.log 824 Log file, useful mostly for debugging
Form_49398.log 867 Log file, useful mostly for debugging
Tune-4939-ABC.abc 0 ABC music file with the extracted tune(s)
Tune-4939-ABC.ps 0 PostScript
Tune-4939-get.log 4081 Log file, useful mostly for debugging
Tune-49392-get.log 1736 Log file, useful mostly for debugging
Tune-49394-get.log 1407 Log file, useful mostly for debugging
Tune-49396-get.log 3227 Log file, useful mostly for debugging
Tune-49398-get.log 3026 Log file, useful mostly for debugging
These files should be available for 24 hours.