pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-17240-halloween.ps) >>/Users/jc/w/tmp/Tune-17240-get.log 2>&1" returned status 256
http://music.gordfisch.net/montrealsession/assets/abc/halloween.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-17240-get.log 4219 Log file, useful mostly for debugging
Tune-17240-halloween.abc 297 ABC music file with the extracted tune(s)
Tune-17240-halloween.ps 34563 PostScript
Tune-17240-halloween.txt 297 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.