pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-55004-WassailTunes.ps) >>/Users/jc/w/tmp/Tune-55004-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/England/WassailTunes.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-55004-WassailTunes.abc 6777 ABC music file with the extracted tune(s)
Tune-55004-WassailTunes.ps 105720 PostScript
Tune-55004-WassailTunes.txt 6777 Plain-text file with the extracted tune(s)
Tune-55004-get.log 18548 Log file, useful mostly for debugging
These files should be available for 24 hours.