pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-41866-Gents_Walk.ps) >>/Users/jc/w/tmp/Tune-41866-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CuzTeahan/SliabhLuachroOnParade/Gents_Walk.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-41866-Gents_Walk.abc 367 ABC music file with the extracted tune(s)
Tune-41866-Gents_Walk.ps 33585 PostScript
Tune-41866-Gents_Walk.txt 367 Plain-text file with the extracted tune(s)
Tune-41866-get.log 4603 Log file, useful mostly for debugging
These files should be available for 24 hours.