pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-83684-halloween.ps) >>/Users/jc/w/tmp/Tune-83684-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-83684-get.log 4377 Log file, useful mostly for debugging
Tune-83684-halloween.abc 326 ABC music file with the extracted tune(s)
Tune-83684-halloween.ps 35961 PostScript
Tune-83684-halloween.txt 326 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.