Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Rare_Small/Kohlers3.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8822-Kohlers3.ps) >>/Users/jc/w/tmp/Tune-8822-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Rare_Small/Kohlers3.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-8822-Kohlers3.abc 151 ABC music file with the extracted tune(s)
Tune-8822-Kohlers3.ps 6 PostScript
Tune-8822-Kohlers3.txt 151 Plain-text file with the extracted tune(s)
Tune-8822-get.log 14116 Log file, useful mostly for debugging
Tune-88221-get.log 7848 Log file, useful mostly for debugging
Tune-88222-get.log 3524 Log file, useful mostly for debugging
Tune-88223-get.log 5427 Log file, useful mostly for debugging
Tune-88226-get.log 5698 Log file, useful mostly for debugging
Tune-88227-get.log 9606 Log file, useful mostly for debugging
Tune-88229-get.log 4600 Log file, useful mostly for debugging
These files should be available for 24 hours.