pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7668-001_Annie_Laurie.ps) >>/Users/jc/w/tmp/Tune-7668-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Chappell/001_Annie_Laurie.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_76687.log 454208 Log file, useful mostly for debugging
Coll_76688.log 455610 Log file, useful mostly for debugging
Form_76682.log 1029 Log file, useful mostly for debugging
Tune-7668-001_Annie_Laurie.abc 570 ABC music file with the extracted tune(s)
Tune-7668-001_Annie_Laurie.ps 35897 PostScript
Tune-7668-001_Annie_Laurie.txt 570 Plain-text file with the extracted tune(s)
Tune-7668-get.log 4506 Log file, useful mostly for debugging
These files should be available for 24 hours.