pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-24245-halloween.ps) >>/Users/jc/w/tmp/Tune-24245-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-24245-get.log 8862 Log file, useful mostly for debugging
Tune-24245-halloween.abc 309 ABC music file with the extracted tune(s)
Tune-24245-halloween.ps 34686 PostScript
Tune-24245-halloween.txt 309 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.