pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-22846-139_Round_Good-night.ps) >>/Users/jc/w/tmp/Tune-22846-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EverydaySongBook/139_Round_Good-night.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-22846-139_Round_Good-night.abc 712 ABC music file with the extracted tune(s)
Tune-22846-139_Round_Good-night.ps 33021 PostScript
Tune-22846-139_Round_Good-night.txt 712 Plain-text file with the extracted tune(s)
Tune-22846-get.log 4712 Log file, useful mostly for debugging
These files should be available for 24 hours.