Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1791/24CountryDances_1818_Button_Whitaker.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5620-24CountryDances_1818_Button_Whitaker.ps) >>/Users/jc/w/tmp/Tune-5620-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1791/24CountryDances_1818_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
Find_56205.log 1840 Log file, useful mostly for debugging
Tune-5620-24CountryDances_1818_Button_Whitaker.abc 173 ABC music file with the extracted tune(s)
Tune-5620-24CountryDances_1818_Button_Whitaker.ps 6 PostScript
Tune-5620-24CountryDances_1818_Button_Whitaker.txt 173 Plain-text file with the extracted tune(s)
Tune-5620-get.log 4612 Log file, useful mostly for debugging
Tune-56203-20000_Title-001.svg 3687 Scalable Vector Graphics format
Tune-56203-20000_Title.abc 1126 ABC music file with the extracted tune(s)
Tune-56203-20000_Title.txt 1126 Plain-text file with the extracted tune(s)
Tune-56203-get.log 4295 Log file, useful mostly for debugging
Tune-56208-get.log 1389 Log file, useful mostly for debugging
These files should be available for 24 hours.