pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-78484-session_Tunes.ps) >>/Users/jc/w/tmp/Tune-78484-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/ceolas.org/session_Tunes.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-78484-get.log 4656 Log file, useful mostly for debugging
Tune-78484-session_Tunes.abc 283 ABC music file with the extracted tune(s)
Tune-78484-session_Tunes.ps 34955 PostScript
Tune-78484-session_Tunes.txt 283 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.