pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-74057-021_the_Black_Bird.ps) >>/Users/jc/w/tmp/Tune-74057-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JohnMacphersonMulhollan/021_the_Black_Bird.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-74057-021_the_Black_Bird.abc 861 ABC music file with the extracted tune(s)
Tune-74057-021_the_Black_Bird.ps 35671 PostScript
Tune-74057-021_the_Black_Bird.txt 861 Plain-text file with the extracted tune(s)
Tune-74057-get.log 8423 Log file, useful mostly for debugging
These files should be available for 24 hours.