pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9304-w.ps) >>/Users/jc/w/tmp/Tune-9304-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/w.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_93048.log 253509 Log file, useful mostly for debugging
Form_93044.log 889 Log file, useful mostly for debugging
Tune-9304-get.log 4246 Log file, useful mostly for debugging
Tune-9304-w.abc 241 ABC music file with the extracted tune(s)
Tune-9304-w.ps 33146 PostScript
Tune-9304-w.txt 241 Plain-text file with the extracted tune(s)
Tune-93047-get.log 3216 Log file, useful mostly for debugging
Tune-93048-get.log 5416 Log file, useful mostly for debugging
These files should be available for 24 hours.