pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-43504-HolbornMarch.ps) >>/Users/jc/w/tmp/Tune-43504-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/england/HolbornMarch.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-43504-HolbornMarch.abc 902 ABC music file with the extracted tune(s)
Tune-43504-HolbornMarch.ps 38430 PostScript
Tune-43504-HolbornMarch.txt 902 Plain-text file with the extracted tune(s)
Tune-43504-get.log 57186 Log file, useful mostly for debugging
These files should be available for 24 hours.