Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book23/OriginallyMine.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7056-OriginallyMine.ps) >>/Users/jc/w/tmp/Tune-7056-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book23/OriginallyMine.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Find_70563.log 1463 Log file, useful mostly for debugging
Tune-7056-OriginallyMine.abc 153 ABC music file with the extracted tune(s)
Tune-7056-OriginallyMine.ps 6 PostScript
Tune-7056-OriginallyMine.txt 153 Plain-text file with the extracted tune(s)
Tune-7056-get.log 7680 Log file, useful mostly for debugging
Tune-70560-get.log 4923 Log file, useful mostly for debugging
Tune-70565-get.log 10362 Log file, useful mostly for debugging
Tune-70566-get.log 9708 Log file, useful mostly for debugging
Tune-70567-get.log 3238 Log file, useful mostly for debugging
Tune-70568-get.log 6847 Log file, useful mostly for debugging
Tune-70569-get.log 7828 Log file, useful mostly for debugging
These files should be available for 24 hours.