Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1777/MichaelDabney_12Minuets12Dances-1760-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9359-MichaelDabney_12Minuets12Dances-1760-V2.ps) >>/Users/jc/w/tmp/Tune-9359-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1777/MichaelDabney_12Minuets12Dances-1760-V2.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-9359-MichaelDabney_12Minuets12Dances-1760-V2.abc 176 ABC music file with the extracted tune(s)
Tune-9359-MichaelDabney_12Minuets12Dances-1760-V2.ps 6 PostScript
Tune-9359-MichaelDabney_12Minuets12Dances-1760-V2.txt 176 Plain-text file with the extracted tune(s)
Tune-9359-get.log 4673 Log file, useful mostly for debugging
Tune-93593-24AmericanCountryDances_1785_Cantelo.abc 172 ABC music file with the extracted tune(s)
Tune-93593-24AmericanCountryDances_1785_Cantelo.txt 172 Plain-text file with the extracted tune(s)
Tune-93593-get.log 3644 Log file, useful mostly for debugging
Tune-93595-get.log 4257 Log file, useful mostly for debugging
These files should be available for 24 hours.