pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-12644-1780_Skillern.ps) >>/Users/jc/w/tmp/Tune-12644-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/1780_Skillern.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-12644-1780_Skillern.abc 18149 ABC music file with the extracted tune(s)
Tune-12644-1780_Skillern.ps 117273 PostScript
Tune-12644-1780_Skillern.txt 18149 Plain-text file with the extracted tune(s)
Tune-12644-get.log 17218 Log file, useful mostly for debugging
These files should be available for 24 hours.