pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9694-Mathematicians.ps) >>/Users/jc/w/tmp/Tune-9694-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/Mathematicians.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_96942.log 902 Log file, useful mostly for debugging
Form_96948.log 916 Log file, useful mostly for debugging
Tune-9694-Mathematicians.abc 1476 ABC music file with the extracted tune(s)
Tune-9694-Mathematicians.ps 43584 PostScript
Tune-9694-Mathematicians.txt 1476 Plain-text file with the extracted tune(s)
Tune-9694-get.log 5197 Log file, useful mostly for debugging
Tune-96949-get.log 3550 Log file, useful mostly for debugging
These files should be available for 24 hours.