pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-62915-LightAndAiry.ps) >>/Users/jc/w/tmp/Tune-62915-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/LightAndAiry.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-62915-LightAndAiry.abc 2277 ABC music file with the extracted tune(s)
Tune-62915-LightAndAiry.ps 51424 PostScript
Tune-62915-LightAndAiry.txt 2277 Plain-text file with the extracted tune(s)
Tune-62915-get.log 4876 Log file, useful mostly for debugging
These files should be available for 24 hours.