pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-20282-421_NeepsLikeSuckerWhaellBuyNeeps.ps) >>/Users/jc/w/tmp/Tune-20282-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Pringle/421_NeepsLikeSuckerWhaellBuyNeeps.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_20282.log 713817 Log file, useful mostly for debugging
Tune-20282-421_NeepsLikeSuckerWhaellBuyNeeps.abc 922 ABC music file with the extracted tune(s)
Tune-20282-421_NeepsLikeSuckerWhaellBuyNeeps.ps 39077 PostScript
Tune-20282-421_NeepsLikeSuckerWhaellBuyNeeps.txt 922 Plain-text file with the extracted tune(s)
Tune-20282-get.log 5146 Log file, useful mostly for debugging
These files should be available for 24 hours.