Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/slide/OriginallyMine.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4449-OriginallyMine.ps) >>/Users/jc/w/tmp/Tune-4449-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/slide/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
Coll_44492.log 301610 Log file, useful mostly for debugging
Tune-4449-OriginallyMine.abc 152 ABC music file with the extracted tune(s)
Tune-4449-OriginallyMine.ps 6 PostScript
Tune-4449-OriginallyMine.txt 152 Plain-text file with the extracted tune(s)
Tune-4449-get.log 5459 Log file, useful mostly for debugging
Tune-44491-get.log 1455 Log file, useful mostly for debugging
Tune-44496-get.log 1433 Log file, useful mostly for debugging
Tune-44499-dim.abc 140 ABC music file with the extracted tune(s)
Tune-44499-dim.ps 6 PostScript
Tune-44499-dim.txt 140 Plain-text file with the extracted tune(s)
Tune-44499-get.log 3967 Log file, useful mostly for debugging
These files should be available for 24 hours.