Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1760/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8310-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-8310-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1760/CaledonianCountryDances.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-8310-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-8310-CaledonianCountryDances.ps 6 PostScript
Tune-8310-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-8310-get.log 7944 Log file, useful mostly for debugging
Tune-83100-get.log 52605 Log file, useful mostly for debugging
Tune-83101-get.log 12115 Log file, useful mostly for debugging
Tune-83103-get.log 9674 Log file, useful mostly for debugging
Tune-83104-get.log 3574 Log file, useful mostly for debugging
Tune-83106-get.log 5621 Log file, useful mostly for debugging
Tune-83107-get.log 4018 Log file, useful mostly for debugging
Tune-83108-get.log 5457 Log file, useful mostly for debugging
Tune-83109-get.log 9488 Log file, useful mostly for debugging
These files should be available for 24 hours.