pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-70092-057_Holy_Night.ps) >>/Users/jc/w/tmp/Tune-70092-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EverydaySongBook/057_Holy_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-70092-057_Holy_Night.abc 1267 ABC music file with the extracted tune(s)
Tune-70092-057_Holy_Night.ps 37340 PostScript
Tune-70092-057_Holy_Night.txt 1267 Plain-text file with the extracted tune(s)
Tune-70092-get.log 4546 Log file, useful mostly for debugging
These files should be available for 24 hours.