Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book03/Kerr_MM1-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8447-Kerr_MM1-V2.ps) >>/Users/jc/w/tmp/Tune-8447-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book03/Kerr_MM1-V2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_84471.log 851 Log file, useful mostly for debugging
Form_84478.log 876 Log file, useful mostly for debugging
Tune-8447-Kerr_MM1-V2.abc 150 ABC music file with the extracted tune(s)
Tune-8447-Kerr_MM1-V2.ps 6 PostScript
Tune-8447-Kerr_MM1-V2.txt 150 Plain-text file with the extracted tune(s)
Tune-8447-get.log 4101 Log file, useful mostly for debugging
Tune-84471-get.log 3574 Log file, useful mostly for debugging
Tune-84473-get.log 3222 Log file, useful mostly for debugging
Tune-84474-get.log 2708 Log file, useful mostly for debugging
Tune-84476-get.log 17745 Log file, useful mostly for debugging
Tune-84479-get.log 3588 Log file, useful mostly for debugging
These files should be available for 24 hours.