Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/save/tune.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5713-tune.ps) >>/Users/jc/w/tmp/Tune-5713-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/save/tune.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_57134.log 270809 Log file, useful mostly for debugging
Coll_57138.log 284812 Log file, useful mostly for debugging
Find_57131.log 1502 Log file, useful mostly for debugging
Tune-5713-get.log 3938 Log file, useful mostly for debugging
Tune-5713-tune.abc 141 ABC music file with the extracted tune(s)
Tune-5713-tune.ps 6 PostScript
Tune-5713-tune.txt 141 Plain-text file with the extracted tune(s)
Tune-57130-get.log 1377 Log file, useful mostly for debugging
These files should be available for 24 hours.