pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28832-Ash_Grove.ps) >>/Users/jc/w/tmp/Tune-28832-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/waltz/Ash_Grove.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-28832-Ash_Grove.abc 497 ABC music file with the extracted tune(s)
Tune-28832-Ash_Grove.ps 35106 PostScript
Tune-28832-Ash_Grove.txt 497 Plain-text file with the extracted tune(s)
Tune-28832-get.log 4672 Log file, useful mostly for debugging
These files should be available for 24 hours.