pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-96759-ChoiceCollection2.ps) >>/Users/jc/w/tmp/Tune-96759-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JohnJohnson/V8/ChoiceCollection2.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Form_96759.log 1695 Log file, useful mostly for debugging
Tune-96759-ChoiceCollection2.abc 731 ABC music file with the extracted tune(s)
Tune-96759-ChoiceCollection2.ps 35130 PostScript
Tune-96759-ChoiceCollection2.txt 731 Plain-text file with the extracted tune(s)
Tune-96759-get.log 50714 Log file, useful mostly for debugging
These files should be available for 24 hours.