Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/PDF/24CountryDances_1770.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6860-24CountryDances_1770.ps) >>/Users/jc/w/tmp/Tune-6860-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/PDF/24CountryDances_1770.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-6860-24CountryDances_1770.abc 156 ABC music file with the extracted tune(s)
Tune-6860-24CountryDances_1770.ps 6 PostScript
Tune-6860-24CountryDances_1770.txt 156 Plain-text file with the extracted tune(s)
Tune-6860-get.log 4268 Log file, useful mostly for debugging
Tune-68600-get.log 4936 Log file, useful mostly for debugging
Tune-68601-get.log 4513 Log file, useful mostly for debugging
Tune-68602-get.log 3886 Log file, useful mostly for debugging
Tune-68603-get.log 5408 Log file, useful mostly for debugging
Tune-68604-get.log 5190 Log file, useful mostly for debugging
Tune-68605-get.log 9394 Log file, useful mostly for debugging
Tune-68608-get.log 10085 Log file, useful mostly for debugging
Tune-68609-get.log 9016 Log file, useful mostly for debugging
These files should be available for 24 hours.