pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-73740-abc2midi.ps) >>/Users/jc/w/tmp/Tune-73740-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/doc/doc/abc2midi.txt

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-73740-abc2midi.abc 120 ABC music file with the extracted tune(s)
Tune-73740-abc2midi.ps 31059 PostScript
Tune-73740-abc2midi.txt 120 Plain-text file with the extracted tune(s)
Tune-73740-get.log 5010 Log file, useful mostly for debugging
These files should be available for 24 hours.