pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-57710-831_Rose.ps) >>/Users/jc/w/tmp/Tune-57710-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1779/Thompson/831_Rose.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-57710-831_Rose.abc 1171 ABC music file with the extracted tune(s)
Tune-57710-831_Rose.ps 36609 PostScript
Tune-57710-831_Rose.txt 1171 Plain-text file with the extracted tune(s)
Tune-57710-get.log 4414 Log file, useful mostly for debugging
These files should be available for 24 hours.