pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-93955-791_Willing_Quaker.ps) >>/Users/jc/w/tmp/Tune-93955-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1779/Thompson/791_Willing_Quaker.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-93955-791_Willing_Quaker.abc 958 ABC music file with the extracted tune(s)
Tune-93955-791_Willing_Quaker.ps 34786 PostScript
Tune-93955-791_Willing_Quaker.txt 958 Plain-text file with the extracted tune(s)
Tune-93955-get.log 4685 Log file, useful mostly for debugging
These files should be available for 24 hours.