pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1502-b.ps) >>/Users/jc/w/tmp/Tune-1502-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
Form_15020.log 972 Log file, useful mostly for debugging
Form_15022.log 905 Log file, useful mostly for debugging
Tune-1502-b.abc 455 ABC music file with the extracted tune(s)
Tune-1502-b.ps 34829 PostScript
Tune-1502-b.txt 455 Plain-text file with the extracted tune(s)
Tune-1502-get.log 315151 Log file, useful mostly for debugging
Tune-15025-get.log 3042 Log file, useful mostly for debugging
Tune-15026-get.log 1053537 Log file, useful mostly for debugging
Tune-15028-get.log 4681 Log file, useful mostly for debugging
Tune-15029-get.log 3165 Log file, useful mostly for debugging
These files should be available for 24 hours.