pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-39852-079_Mill_O_The.ps) >>/Users/jc/w/tmp/Tune-39852-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Chappell/079_Mill_O_The.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-39852-079_Mill_O_The.abc 693 ABC music file with the extracted tune(s)
Tune-39852-079_Mill_O_The.ps 37923 PostScript
Tune-39852-079_Mill_O_The.txt 693 Plain-text file with the extracted tune(s)
Tune-39852-get.log 5033 Log file, useful mostly for debugging
These files should be available for 24 hours.