pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-87553-m.ps) >>/Users/jc/w/tmp/Tune-87553-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/m.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
Tune-87553-get.log 4251 Log file, useful mostly for debugging
Tune-87553-m.abc 360 ABC music file with the extracted tune(s)
Tune-87553-m.ps 35891 PostScript
Tune-87553-m.txt 360 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.