pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-23241-WIND_THAT_SHAKES_THE_BARLEY_THE.ps) >>/Users/jc/w/tmp/Tune-23241-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/www.chivalry.com/WIND_THAT_SHAKES_THE_BARLEY_THE.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-23241-WIND_THAT_SHAKES_THE_BARLEY_THE.abc 0 ABC music file with the extracted tune(s)
Tune-23241-WIND_THAT_SHAKES_THE_BARLEY_THE.ps 0 PostScript
Tune-23241-get.log 0 Log file, useful mostly for debugging
These files should be available for 24 hours.