pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-47017-AmericanSD.ps) >>/Users/jc/w/tmp/Tune-47017-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ViolaRuth/AmericanSD.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_47017.log 459810 Log file, useful mostly for debugging
Tune-47017-AmericanSD.abc 8423 ABC music file with the extracted tune(s)
Tune-47017-AmericanSD.ps 111390 PostScript
Tune-47017-AmericanSD.txt 8423 Plain-text file with the extracted tune(s)
Tune-47017-get.log 11526 Log file, useful mostly for debugging
These files should be available for 24 hours.