Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/William_Thomas_Green/Gow-CSR3-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7699-Gow-CSR3-abc2.ps) >>/Users/jc/w/tmp/Tune-7699-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/William_Thomas_Green/Gow-CSR3-abc2.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_76992.log 630612 Log file, useful mostly for debugging
Tune-7699-Gow-CSR3-abc2.abc 166 ABC music file with the extracted tune(s)
Tune-7699-Gow-CSR3-abc2.ps 6 PostScript
Tune-7699-Gow-CSR3-abc2.txt 166 Plain-text file with the extracted tune(s)
Tune-7699-get.log 8708 Log file, useful mostly for debugging
Tune-76990-get.log 3084 Log file, useful mostly for debugging
Tune-76991-get.log 4052 Log file, useful mostly for debugging
Tune-76994-get.log 3394 Log file, useful mostly for debugging
Tune-76997-get.log 4593 Log file, useful mostly for debugging
Tune-76998-get.log 5459 Log file, useful mostly for debugging
Tune-76999-get.log 4416 Log file, useful mostly for debugging
These files should be available for 24 hours.