pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5171-s.ps) >>/Users/jc/w/tmp/Tune-5171-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/s.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_51713.log 254919 Log file, useful mostly for debugging
Tune-5171-get.log 4234 Log file, useful mostly for debugging
Tune-5171-s.abc 258 ABC music file with the extracted tune(s)
Tune-5171-s.ps 34902 PostScript
Tune-5171-s.txt 258 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.