Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1803/JohnJohnson_ChoiceCollectionVol8-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3424-JohnJohnson_ChoiceCollectionVol8-V1.ps) >>/Users/jc/w/tmp/Tune-3424-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1803/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-3424-JohnJohnson_ChoiceCollectionVol8-V1.abc 172 ABC music file with the extracted tune(s)
Tune-3424-JohnJohnson_ChoiceCollectionVol8-V1.ps 6 PostScript
Tune-3424-JohnJohnson_ChoiceCollectionVol8-V1.txt 172 Plain-text file with the extracted tune(s)
Tune-3424-get.log 19329 Log file, useful mostly for debugging
Tune-34241-get.log 10988 Log file, useful mostly for debugging
Tune-34242-get.log 4542 Log file, useful mostly for debugging
Tune-34243-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.abc 186 ABC music file with the extracted tune(s)
Tune-34243-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.pdf 2217 Portable Data Format
Tune-34243-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.ps 6 PostScript
Tune-34243-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.txt 186 Plain-text file with the extracted tune(s)
Tune-34243-get.log 20044 Log file, useful mostly for debugging
Tune-34244-get.log 3160 Log file, useful mostly for debugging
Tune-34246-get.log 4600 Log file, useful mostly for debugging
Tune-34247-get.log 14859 Log file, useful mostly for debugging
Tune-34248-get.log 4170 Log file, useful mostly for debugging
Tune-34249-get.log 3919 Log file, useful mostly for debugging
These files should be available for 24 hours.