pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-99601-minstrelsy.ps) >>/Users/jc/w/tmp/Tune-99601-get.log 2>&1" returned status 256
http://music.gordfisch.net/montrealsession/assets/abc/minstrelsy.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-99601-get.log 4397 Log file, useful mostly for debugging
Tune-99601-minstrelsy.abc 219 ABC music file with the extracted tune(s)
Tune-99601-minstrelsy.ps 33792 PostScript
Tune-99601-minstrelsy.txt 219 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.