pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-72641-Don_Jumpedo.ps) >>/Users/jc/w/tmp/Tune-72641-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/GM/Don_Jumpedo.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-72641-Don_Jumpedo.abc 789 ABC music file with the extracted tune(s)
Tune-72641-Don_Jumpedo.ps 34776 PostScript
Tune-72641-Don_Jumpedo.txt 789 Plain-text file with the extracted tune(s)
Tune-72641-get.log 4383 Log file, useful mostly for debugging
These files should be available for 24 hours.