pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-94939-c.ps) >>/Users/jc/w/tmp/Tune-94939-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/atrilcoral.com/c.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-94939-c.abc 373 ABC music file with the extracted tune(s)
Tune-94939-c.ps 36551 PostScript
Tune-94939-c.txt 373 Plain-text file with the extracted tune(s)
Tune-94939-get.log 4286 Log file, useful mostly for debugging
These files should be available for 24 hours.