pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-42558-312_Post_Coach.ps) >>/Users/jc/w/tmp/Tune-42558-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1767/Thompson/312_Post_Coach.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-42558-312_Post_Coach.abc 1047 ABC music file with the extracted tune(s)
Tune-42558-312_Post_Coach.ps 34548 PostScript
Tune-42558-312_Post_Coach.txt 1047 Plain-text file with the extracted tune(s)
Tune-42558-get.log 9672 Log file, useful mostly for debugging
These files should be available for 24 hours.