pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-35636-Nonesuch_2.ps) >>/Users/jc/w/tmp/Tune-35636-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/Nonesuch_2.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-35636-Nonesuch_2.abc 348 ABC music file with the extracted tune(s)
Tune-35636-Nonesuch_2.ps 33620 PostScript
Tune-35636-Nonesuch_2.txt 348 Plain-text file with the extracted tune(s)
Tune-35636-get.log 4366 Log file, useful mostly for debugging
These files should be available for 24 hours.