pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-80724-Christ_Childs_Lullaby-A-16-2.ps) >>/Users/jc/w/tmp/Tune-80724-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/waltz/Christ_Childs_Lullaby-A-16-2.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_80724.log 261969 Log file, useful mostly for debugging
Tune-80724-Christ_Childs_Lullaby-A-16-2.abc 0 ABC music file with the extracted tune(s)
Tune-80724-Christ_Childs_Lullaby-A-16-2.ps 0 PostScript
Tune-80724-get.log 0 Log file, useful mostly for debugging
These files should be available for 24 hours.