pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-41755-GlennTowle.ps) >>/Users/jc/w/tmp/Tune-41755-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/england/GlennTowle.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-41755-GlennTowle.abc 1496 ABC music file with the extracted tune(s)
Tune-41755-GlennTowle.ps 42309 PostScript
Tune-41755-GlennTowle.txt 1496 Plain-text file with the extracted tune(s)
Tune-41755-get.log 4799 Log file, useful mostly for debugging
These files should be available for 24 hours.