pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-24050-Blackbird_985-D-90-0.ps) >>/Users/jc/w/tmp/Tune-24050-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ONeills/march/Blackbird_985-D-90-0.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_24050.log 717171 Log file, useful mostly for debugging
Tune-24050-Blackbird_985-D-90-0.abc 762 ABC music file with the extracted tune(s)
Tune-24050-Blackbird_985-D-90-0.ps 37440 PostScript
Tune-24050-Blackbird_985-D-90-0.txt 762 Plain-text file with the extracted tune(s)
Tune-24050-get.log 4721 Log file, useful mostly for debugging
These files should be available for 24 hours.