pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-67402-Whitehall_6.ps) >>/Users/jc/w/tmp/Tune-67402-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JohnWalsh/Whitehall_6.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_67402.log 1002 Log file, useful mostly for debugging
Tune-67402-Whitehall_6.abc 1923 ABC music file with the extracted tune(s)
Tune-67402-Whitehall_6.ps 34757 PostScript
Tune-67402-Whitehall_6.txt 1923 Plain-text file with the extracted tune(s)
Tune-67402-get.log 4405 Log file, useful mostly for debugging
These files should be available for 24 hours.