Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1793/JohnJohnson_ChoiceCollectionVol8-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4390-JohnJohnson_ChoiceCollectionVol8-V1.ps) >>/Users/jc/w/tmp/Tune-4390-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1793/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-4390-JohnJohnson_ChoiceCollectionVol8-V1.abc 172 ABC music file with the extracted tune(s)
Tune-4390-JohnJohnson_ChoiceCollectionVol8-V1.ps 6 PostScript
Tune-4390-JohnJohnson_ChoiceCollectionVol8-V1.txt 172 Plain-text file with the extracted tune(s)
Tune-4390-get.log 4593 Log file, useful mostly for debugging
Tune-43900-10661_Miss_Browns_Reel.abc 685 ABC music file with the extracted tune(s)
Tune-43900-10661_Miss_Browns_Reel.pdf 14299 Portable Data Format
Tune-43900-10661_Miss_Browns_Reel.ps 36456 PostScript
Tune-43900-10661_Miss_Browns_Reel.txt 685 Plain-text file with the extracted tune(s)
Tune-43900-get.log 189035 Log file, useful mostly for debugging
Tune-43901-get.log 3672 Log file, useful mostly for debugging
Tune-43902-get.log 8991 Log file, useful mostly for debugging
Tune-43903-get.log 12197 Log file, useful mostly for debugging
Tune-43904-get.log 5727 Log file, useful mostly for debugging
Tune-43905-get.log 4559 Log file, useful mostly for debugging
Tune-43906-get.log 4535 Log file, useful mostly for debugging
Tune-43907-get.log 5435 Log file, useful mostly for debugging
These files should be available for 24 hours.