pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-42558-KnitThePocky.ps) >>/Users/jc/w/tmp/Tune-42558-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/KnitThePocky.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
Tune-42558-KnitThePocky.abc 411 ABC music file with the extracted tune(s)
Tune-42558-KnitThePocky.ps 33526 PostScript
Tune-42558-KnitThePocky.txt 411 Plain-text file with the extracted tune(s)
Tune-42558-get.log 6016 Log file, useful mostly for debugging
These files should be available for 24 hours.