Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-95654-24CountryDances_1812_JGray.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4470-Tune-95654-24CountryDances_1812_JGray.ps) >>/Users/jc/w/tmp/Tune-4470-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-95654-24CountryDances_1812_JGray.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_4470.log 462610 Log file, useful mostly for debugging
Coll_44700.log 459810 Log file, useful mostly for debugging
Coll_44702.log 900017 Log file, useful mostly for debugging
Coll_44709.log 457010 Log file, useful mostly for debugging
Form_44709.log 986 Log file, useful mostly for debugging
Tune-4470-Tune-95654-24CountryDances_1812_JGray.abc 189 ABC music file with the extracted tune(s)
Tune-4470-Tune-95654-24CountryDances_1812_JGray.ps 6 PostScript
Tune-4470-Tune-95654-24CountryDances_1812_JGray.txt 189 Plain-text file with the extracted tune(s)
Tune-4470-get.log 4719 Log file, useful mostly for debugging
These files should be available for 24 hours.