Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/abc1/CMCIT.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4307-CMCIT.ps) >>/Users/jc/w/tmp/Tune-4307-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/abc1/CMCIT.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-4307-CMCIT.abc 142 ABC music file with the extracted tune(s)
Tune-4307-CMCIT.ps 6 PostScript
Tune-4307-CMCIT.txt 142 Plain-text file with the extracted tune(s)
Tune-4307-get.log 3959 Log file, useful mostly for debugging
Tune-43070-get.log 4732 Log file, useful mostly for debugging
Tune-43071-get.log 7538 Log file, useful mostly for debugging
Tune-43072-get.log 4682 Log file, useful mostly for debugging
Tune-43073-get.log 4664 Log file, useful mostly for debugging
Tune-43074-get.log 10049 Log file, useful mostly for debugging
Tune-43075-get.log 9314 Log file, useful mostly for debugging
Tune-43076-get.log 3831 Log file, useful mostly for debugging
Tune-43077-get.log 9683 Log file, useful mostly for debugging
Tune-43078-get.log 4494 Log file, useful mostly for debugging
These files should be available for 24 hours.