pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-68255-10252_Rose_Tree.ps) >>/Users/jc/w/tmp/Tune-68255-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ERM/10252_Rose_Tree.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_68255.log 270809 Log file, useful mostly for debugging
Tune-68255-10252_Rose_Tree.abc 549 ABC music file with the extracted tune(s)
Tune-68255-10252_Rose_Tree.ps 34344 PostScript
Tune-68255-10252_Rose_Tree.txt 549 Plain-text file with the extracted tune(s)
Tune-68255-get.log 4517 Log file, useful mostly for debugging
These files should be available for 24 hours.