Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/slide/v2tune.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8063-v2tune.ps) >>/Users/jc/w/tmp/Tune-8063-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/slide/v2tune.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-8063-get.log 7859 Log file, useful mostly for debugging
Tune-8063-v2tune.abc 144 ABC music file with the extracted tune(s)
Tune-8063-v2tune.ps 6 PostScript
Tune-8063-v2tune.txt 144 Plain-text file with the extracted tune(s)
Tune-80632-get.log 4243 Log file, useful mostly for debugging
Tune-80634-William_Clarke_MS_1770.abc 159 ABC music file with the extracted tune(s)
Tune-80634-William_Clarke_MS_1770.pdf 2217 Portable Data Format
Tune-80634-William_Clarke_MS_1770.ps 6 PostScript
Tune-80634-William_Clarke_MS_1770.txt 159 Plain-text file with the extracted tune(s)
Tune-80634-get.log 5232 Log file, useful mostly for debugging
Tune-80638-get.log 1413 Log file, useful mostly for debugging
These files should be available for 24 hours.