Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/CDM5/Kohlers.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1402-Kohlers.ps) >>/Users/jc/w/tmp/Tune-1402-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CDM5/Kohlers.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_1402.log 158416 Log file, useful mostly for debugging
Tune-1402-Kohlers.abc 144 ABC music file with the extracted tune(s)
Tune-1402-Kohlers.ps 6 PostScript
Tune-1402-Kohlers.txt 144 Plain-text file with the extracted tune(s)
Tune-1402-get.log 4003 Log file, useful mostly for debugging
Tune-14020-get.log 7358 Log file, useful mostly for debugging
Tune-14022-get.log 4870 Log file, useful mostly for debugging
Tune-14023-get.log 4747 Log file, useful mostly for debugging
Tune-14028-get.log 4374 Log file, useful mostly for debugging
Tune-14029-get.log 9344 Log file, useful mostly for debugging
These files should be available for 24 hours.