pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-22839-Chansons.ps) >>/Users/jc/w/tmp/Tune-22839-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/galouvielle.free.fr/Chansons%20pour%20Elisabeth.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-22839-Chansons.abc 654 ABC music file with the extracted tune(s)
Tune-22839-Chansons.ps 34346 PostScript
Tune-22839-Chansons.txt 654 Plain-text file with the extracted tune(s)
Tune-22839-get.log 10672 Log file, useful mostly for debugging
These files should be available for 24 hours.