pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4253-b.ps) >>/Users/jc/w/tmp/Tune-4253-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/atrilcoral.com/b.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-4253-b.abc 450 ABC music file with the extracted tune(s)
Tune-4253-b.ps 37368 PostScript
Tune-4253-b.txt 450 Plain-text file with the extracted tune(s)
Tune-4253-get.log 323282 Log file, useful mostly for debugging
Tune-42530-get.log 3941 Log file, useful mostly for debugging
Tune-42538-get.log 5713 Log file, useful mostly for debugging
These files should be available for 24 hours.