pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-13723-AlfSongs.ps) >>/Users/jc/w/tmp/Tune-13723-get.log 2>&1" returned status 256
http://www.alfwarnock.info/alfs/abc/AlfSongs.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-13723-AlfSongs.abc 372 ABC music file with the extracted tune(s)
Tune-13723-AlfSongs.ps 34520 PostScript
Tune-13723-AlfSongs.txt 372 Plain-text file with the extracted tune(s)
Tune-13723-get.log 4222 Log file, useful mostly for debugging
These files should be available for 24 hours.