pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-50736-alfmarch.ps) >>/Users/jc/w/tmp/Tune-50736-get.log 2>&1" returned status 256
http://www.alfwarnock.info/alfs/abc/alfmarch.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-50736-alfmarch.abc 424 ABC music file with the extracted tune(s)
Tune-50736-alfmarch.ps 38489 PostScript
Tune-50736-alfmarch.txt 424 Plain-text file with the extracted tune(s)
Tune-50736-get.log 4238 Log file, useful mostly for debugging
These files should be available for 24 hours.