pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3798-PMMCLEAN.ps) >>/Users/jc/w/tmp/Tune-3798-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/corneymusers/orig/PMMCLEAN.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
Coll_37980.log 47 Log file, useful mostly for debugging
Coll_37982.log 22009 Log file, useful mostly for debugging
Coll_37983.log 46 Log file, useful mostly for debugging
Coll_37984.log 47 Log file, useful mostly for debugging
Coll_37986.log 46 Log file, useful mostly for debugging
Coll_37987.log 46 Log file, useful mostly for debugging
Coll_37988.log 259149 Log file, useful mostly for debugging
Coll_37989.log 54072 Log file, useful mostly for debugging
Tune-3798-PMMCLEAN.abc 1064 ABC music file with the extracted tune(s)
Tune-3798-PMMCLEAN.ps 49611 PostScript
Tune-3798-PMMCLEAN.txt 1064 Plain-text file with the extracted tune(s)
Tune-3798-get.log 4563 Log file, useful mostly for debugging
These files should be available for 24 hours.