pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-68466-Bourree_2_time_5.ps) >>/Users/jc/w/tmp/Tune-68466-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/bourree/Bourree_2_time_5.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_68466.log 423428 Log file, useful mostly for debugging
Tune-68466-Bourree_2_time_5.abc 282 ABC music file with the extracted tune(s)
Tune-68466-Bourree_2_time_5.ps 33728 PostScript
Tune-68466-Bourree_2_time_5.txt 282 Plain-text file with the extracted tune(s)
Tune-68466-get.log 11369 Log file, useful mostly for debugging
These files should be available for 24 hours.