pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28640-20742_Plough_Boy.ps) >>/Users/jc/w/tmp/Tune-28640-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ERM/20742_Plough_Boy.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-28640-20742_Plough_Boy.abc 517 ABC music file with the extracted tune(s)
Tune-28640-20742_Plough_Boy.ps 34016 PostScript
Tune-28640-20742_Plough_Boy.txt 517 Plain-text file with the extracted tune(s)
Tune-28640-LothianLads_F.abc 787 ABC music file with the extracted tune(s)
Tune-28640-LothianLads_F.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-28640-LothianLads_F.ps 37759 PostScript
Tune-28640-LothianLads_F.txt 787 Plain-text file with the extracted tune(s)
Tune-28640-get.log 9794 Log file, useful mostly for debugging
These files should be available for 24 hours.