pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-24280-DowniesHumour.ps) >>/Users/jc/w/tmp/Tune-24280-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/Scotland/DowniesHumour.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-24280-DowniesHumour.abc 1761 ABC music file with the extracted tune(s)
Tune-24280-DowniesHumour.ps 48306 PostScript
Tune-24280-DowniesHumour.txt 1761 Plain-text file with the extracted tune(s)
Tune-24280-get.log 4898 Log file, useful mostly for debugging
These files should be available for 24 hours.