pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8973-b.ps) >>/Users/jc/w/tmp/Tune-8973-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/b.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
Find_89731.log 1483 Log file, useful mostly for debugging
Form_89730.log 855 Log file, useful mostly for debugging
Form_89737.log 823 Log file, useful mostly for debugging
Tune-8973-b.abc 282 ABC music file with the extracted tune(s)
Tune-8973-b.ps 34257 PostScript
Tune-8973-b.txt 282 Plain-text file with the extracted tune(s)
Tune-8973-get.log 9541 Log file, useful mostly for debugging
Tune-89730-c.abc 184 ABC music file with the extracted tune(s)
Tune-89730-c.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-89730-c.ps 34348 PostScript
Tune-89730-c.txt 184 Plain-text file with the extracted tune(s)
Tune-89730-get.log 8533 Log file, useful mostly for debugging
Tune-89736-get.log 5102 Log file, useful mostly for debugging
Tune-89739-get.log 3764 Log file, useful mostly for debugging
These files should be available for 24 hours.