pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-27767-Buttermilk_Mary-A-32-2.ps) >>/Users/jc/w/tmp/Tune-27767-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/jig/Buttermilk_Mary-A-32-2.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_27767.log 261850 Log file, useful mostly for debugging
Tune-27767-Buttermilk_Mary-A-32-2.abc 494 ABC music file with the extracted tune(s)
Tune-27767-Buttermilk_Mary-A-32-2.ps 34805 PostScript
Tune-27767-Buttermilk_Mary-A-32-2.txt 494 Plain-text file with the extracted tune(s)
Tune-27767-get.log 4744 Log file, useful mostly for debugging
These files should be available for 24 hours.