Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1770/JohnJohnson_ChoiceCollectionVol8-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4755-JohnJohnson_ChoiceCollectionVol8-V1.ps) >>/Users/jc/w/tmp/Tune-4755-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1770/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-4755-JohnJohnson_ChoiceCollectionVol8-V1.abc 172 ABC music file with the extracted tune(s)
Tune-4755-JohnJohnson_ChoiceCollectionVol8-V1.ps 6 PostScript
Tune-4755-JohnJohnson_ChoiceCollectionVol8-V1.txt 172 Plain-text file with the extracted tune(s)
Tune-4755-get.log 14669 Log file, useful mostly for debugging
Tune-47550-get.log 8845 Log file, useful mostly for debugging
Tune-47552-get.log 3232 Log file, useful mostly for debugging
Tune-47553-get.log 8571 Log file, useful mostly for debugging
Tune-47557-20563_My_Long_Tail_Blue.abc 761 ABC music file with the extracted tune(s)
Tune-47557-20563_My_Long_Tail_Blue.pdf 13719 Portable Data Format
Tune-47557-20563_My_Long_Tail_Blue.ps 34870 PostScript
Tune-47557-20563_My_Long_Tail_Blue.txt 761 Plain-text file with the extracted tune(s)
Tune-47557-get.log 5939 Log file, useful mostly for debugging
Tune-47558-Tune-74252-24CountryDances_1799_Preston.abc 191 ABC music file with the extracted tune(s)
Tune-47558-Tune-74252-24CountryDances_1799_Preston.txt 191 Plain-text file with the extracted tune(s)
Tune-47558-get.log 3288 Log file, useful mostly for debugging
Tune-47559-get.log 3314 Log file, useful mostly for debugging
These files should be available for 24 hours.