pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-91004-Chimes_of_Dunkirk-D,A,C,G-24-2.ps) >>/Users/jc/w/tmp/Tune-91004-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/march/Chimes_of_Dunkirk-D,A,C,G-24-2.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
Tune-91004-Chimes_of_Dunkirk-D,A,C,G-24-2.abc 1813 ABC music file with the extracted tune(s)
Tune-91004-Chimes_of_Dunkirk-D,A,C,G-24-2.ps 42718 PostScript
Tune-91004-Chimes_of_Dunkirk-D,A,C,G-24-2.txt 1813 Plain-text file with the extracted tune(s)
Tune-91004-get.log 5780 Log file, useful mostly for debugging
These files should be available for 24 hours.