Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book06/24CountryDances_1813_Button_Whitaker.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2760-24CountryDances_1813_Button_Whitaker.ps) >>/Users/jc/w/tmp/Tune-2760-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book06/24CountryDances_1813_Button_Whitaker.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-2760-24CountryDances_1813_Button_Whitaker.abc 175 ABC music file with the extracted tune(s)
Tune-2760-24CountryDances_1813_Button_Whitaker.ps 6 PostScript
Tune-2760-24CountryDances_1813_Button_Whitaker.txt 175 Plain-text file with the extracted tune(s)
Tune-2760-get.log 4624 Log file, useful mostly for debugging
Tune-27603-get.log 4107 Log file, useful mostly for debugging
Tune-27604-get.log 6046 Log file, useful mostly for debugging
Tune-27605-get.log 9872 Log file, useful mostly for debugging
Tune-27606-get.log 10982 Log file, useful mostly for debugging
Tune-27608-get.log 13393 Log file, useful mostly for debugging
These files should be available for 24 hours.