pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-3777-053_Jock_O_Hazeldean.abc -F fmt/pdf_55.fmt +s 0.55 +maxs 2000 )>/Users/jc/w/tmp/Tune-3777-053_Jock_O_Hazeldean.ps 2>>/Users/jc/w/tmp/Tune-3777-get.log" returned status 34304.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3777-053_Jock_O_Hazeldean.ps) >>/Users/jc/w/tmp/Tune-3777-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Chappell/053_Jock_O_Hazeldean.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_37773.log 444409 Log file, useful mostly for debugging
Form_37772.log 917 Log file, useful mostly for debugging
Form_37773.log 883 Log file, useful mostly for debugging
Form_37774.log 993 Log file, useful mostly for debugging
Form_37778.log 963 Log file, useful mostly for debugging
Tune-3777-053_Jock_O_Hazeldean.abc 568 ABC music file with the extracted tune(s)
Tune-3777-053_Jock_O_Hazeldean.ps 30545 PostScript
Tune-3777-053_Jock_O_Hazeldean.txt 568 Plain-text file with the extracted tune(s)
Tune-3777-get.log 5551 Log file, useful mostly for debugging
Tune-37779-get.log 1435 Log file, useful mostly for debugging
These files should be available for 24 hours.