pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7653-AbbeyThe.ps) >>/Users/jc/w/tmp/Tune-7653-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/demo/Tunes/AbbeyThe.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
Coll_76535.log 147647 Log file, useful mostly for debugging
Tune-7653-AbbeyThe.abc 294 ABC music file with the extracted tune(s)
Tune-7653-AbbeyThe.ps 36484 PostScript
Tune-7653-AbbeyThe.txt 294 Plain-text file with the extracted tune(s)
Tune-7653-get.log 4231 Log file, useful mostly for debugging
Tune-76532-get.log 4676 Log file, useful mostly for debugging
Tune-76533-get.log 3311 Log file, useful mostly for debugging
These files should be available for 24 hours.