Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1791/JohnJohnson_ChoiceCollectionVol8-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2949-JohnJohnson_ChoiceCollectionVol8-V1.ps) >>/Users/jc/w/tmp/Tune-2949-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1791/JohnJohnson_ChoiceCollectionVol8-V1.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-2949-JohnJohnson_ChoiceCollectionVol8-V1.abc 172 ABC music file with the extracted tune(s)
Tune-2949-JohnJohnson_ChoiceCollectionVol8-V1.ps 6 PostScript
Tune-2949-JohnJohnson_ChoiceCollectionVol8-V1.txt 172 Plain-text file with the extracted tune(s)
Tune-2949-get.log 4593 Log file, useful mostly for debugging
Tune-29490-get.log 9517 Log file, useful mostly for debugging
Tune-29491-get.log 4674 Log file, useful mostly for debugging
Tune-29492-get.log 7767 Log file, useful mostly for debugging
Tune-29495-get.log 10154 Log file, useful mostly for debugging
Tune-29498-get.log 8826 Log file, useful mostly for debugging
Tune-29499-get.log 8092 Log file, useful mostly for debugging
These files should be available for 24 hours.