Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book21/PaulBackstrom-LfD.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6518-PaulBackstrom-LfD.ps) >>/Users/jc/w/tmp/Tune-6518-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book21/PaulBackstrom-LfD.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_65180.log 358242 Log file, useful mostly for debugging
Coll_65184.log 634810 Log file, useful mostly for debugging
Find_65181.log 1623 Log file, useful mostly for debugging
Find_65185.log 1543 Log file, useful mostly for debugging
Tune-6518-PaulBackstrom-LfD.abc 156 ABC music file with the extracted tune(s)
Tune-6518-PaulBackstrom-LfD.ps 6 PostScript
Tune-6518-PaulBackstrom-LfD.txt 156 Plain-text file with the extracted tune(s)
Tune-6518-get.log 4221 Log file, useful mostly for debugging
Tune-65180-get.log 1652 Log file, useful mostly for debugging
Tune-65181-get.log 7579 Log file, useful mostly for debugging
Tune-65182-get.log 4805 Log file, useful mostly for debugging
Tune-65186-get.log 2971 Log file, useful mostly for debugging
Tune-65187-get.log 4532 Log file, useful mostly for debugging
Tune-65188-get.log 7468 Log file, useful mostly for debugging
These files should be available for 24 hours.