pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28767-Nellie_Jackson-D-32-3.ps) >>/Users/jc/w/tmp/Tune-28767-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/jig/Nellie_Jackson-D-32-3.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_28767.log 261850 Log file, useful mostly for debugging
Tune-28767-Nellie_Jackson-D-32-3.abc 816 ABC music file with the extracted tune(s)
Tune-28767-Nellie_Jackson-D-32-3.ps 36523 PostScript
Tune-28767-Nellie_Jackson-D-32-3.txt 816 Plain-text file with the extracted tune(s)
Tune-28767-get.log 4715 Log file, useful mostly for debugging
These files should be available for 24 hours.