pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3342-4271.ps) >>/Users/jc/w/tmp/Tune-3342-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/4271=Miss_Wedderburns_Reel-abc2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_33424.log 1352131 Log file, useful mostly for debugging
Coll_33425.log 1809276 Log file, useful mostly for debugging
Tune-3342-4271.abc 1440 ABC music file with the extracted tune(s)
Tune-3342-4271.ps 46203 PostScript
Tune-3342-4271.txt 1440 Plain-text file with the extracted tune(s)
Tune-3342-get.log 5377 Log file, useful mostly for debugging
Tune-33423-get.log 3800 Log file, useful mostly for debugging
Tune-33429-get.log 3971 Log file, useful mostly for debugging
These files should be available for 24 hours.