Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM4/FOEFDA.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3834-FOEFDA.ps) >>/Users/jc/w/tmp/Tune-3834-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM4/FOEFDA.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-3834-FOEFDA.abc 142 ABC music file with the extracted tune(s)
Tune-3834-FOEFDA.ps 6 PostScript
Tune-3834-FOEFDA.txt 142 Plain-text file with the extracted tune(s)
Tune-3834-get.log 8683 Log file, useful mostly for debugging
Tune-38340-get.log 3506 Log file, useful mostly for debugging
Tune-38343-get.log 4404 Log file, useful mostly for debugging
Tune-38344-get.log 3166 Log file, useful mostly for debugging
Tune-38346-get.log 11800 Log file, useful mostly for debugging
Tune-38347-get.log 3102 Log file, useful mostly for debugging
Tune-38348-get.log 10635 Log file, useful mostly for debugging
These files should be available for 24 hours.