Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/www/Gow-CSR4-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4506-Gow-CSR4-abc1.ps) >>/Users/jc/w/tmp/Tune-4506-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/www/Gow-CSR4-abc1.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_45060.log 270717 Log file, useful mostly for debugging
Coll_45061.log 832340 Log file, useful mostly for debugging
Coll_45063.log 849018 Log file, useful mostly for debugging
Coll_45069.log 725637 Log file, useful mostly for debugging
Tune-4506-Gow-CSR4-abc1.abc 149 ABC music file with the extracted tune(s)
Tune-4506-Gow-CSR4-abc1.ps 6 PostScript
Tune-4506-Gow-CSR4-abc1.txt 149 Plain-text file with the extracted tune(s)
Tune-4506-get.log 14169 Log file, useful mostly for debugging
Tune-45060-get.log 14959 Log file, useful mostly for debugging
Tune-45061-get.log 7676 Log file, useful mostly for debugging
Tune-45063-get.log 9798 Log file, useful mostly for debugging
Tune-45065-get.log 20001 Log file, useful mostly for debugging
These files should be available for 24 hours.