pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-22616-k.ps) >>/Users/jc/w/tmp/Tune-22616-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/k.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-22616-get.log 8227 Log file, useful mostly for debugging
Tune-22616-k.abc 450 ABC music file with the extracted tune(s)
Tune-22616-k.ps 36800 PostScript
Tune-22616-k.txt 450 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.