Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1813/JohnJohnson_ChoiceCollectionVol8-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3086-JohnJohnson_ChoiceCollectionVol8-V2.ps) >>/Users/jc/w/tmp/Tune-3086-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1813/JohnJohnson_ChoiceCollectionVol8-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-3086-JohnJohnson_ChoiceCollectionVol8-V2.abc 172 ABC music file with the extracted tune(s)
Tune-3086-JohnJohnson_ChoiceCollectionVol8-V2.ps 6 PostScript
Tune-3086-JohnJohnson_ChoiceCollectionVol8-V2.txt 172 Plain-text file with the extracted tune(s)
Tune-3086-get.log 4593 Log file, useful mostly for debugging
Tune-30861-get.log 1388 Log file, useful mostly for debugging
Tune-30862-Tune-61684-101_Wirtemberg_Waltz.abc 183 ABC music file with the extracted tune(s)
Tune-30862-Tune-61684-101_Wirtemberg_Waltz.ps 6 PostScript
Tune-30862-Tune-61684-101_Wirtemberg_Waltz.txt 183 Plain-text file with the extracted tune(s)
Tune-30862-get.log 9893 Log file, useful mostly for debugging
Tune-30863-get.log 4510 Log file, useful mostly for debugging
Tune-30865-get.log 20659 Log file, useful mostly for debugging
Tune-30868-get.log 5707 Log file, useful mostly for debugging
Tune-30869-get.log 1377 Log file, useful mostly for debugging
These files should be available for 24 hours.