Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1785/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8491-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-8491-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1785/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
Coll_84911.log 479412 Log file, useful mostly for debugging
Tune-8491-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-8491-CaledonianCountryDances.ps 6 PostScript
Tune-8491-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-8491-get.log 4337 Log file, useful mostly for debugging
Tune-84910-get.log 7494 Log file, useful mostly for debugging
Tune-84911-get.log 13458 Log file, useful mostly for debugging
Tune-84913-get.log 3592 Log file, useful mostly for debugging
Tune-84914-get.log 5561 Log file, useful mostly for debugging
Tune-84915-get.log 4594 Log file, useful mostly for debugging
Tune-84918-get.log 17032 Log file, useful mostly for debugging
Tune-84919-get.log 9002 Log file, useful mostly for debugging
These files should be available for 24 hours.