pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-22427-p4.ps) >>/Users/jc/w/tmp/Tune-22427-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JohnWalsh/p4.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_22427.log 942 Log file, useful mostly for debugging
Tune-22427-get.log 4639 Log file, useful mostly for debugging
Tune-22427-p4.abc 529 ABC music file with the extracted tune(s)
Tune-22427-p4.ps 31015 PostScript
Tune-22427-p4.txt 529 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.