Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-68263-alltunes.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3757-Tune-68263-alltunes.ps) >>/Users/jc/w/tmp/Tune-3757-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-68263-alltunes.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-3757-Tune-68263-alltunes.abc 171 ABC music file with the extracted tune(s)
Tune-3757-Tune-68263-alltunes.ps 6 PostScript
Tune-3757-Tune-68263-alltunes.txt 171 Plain-text file with the extracted tune(s)
Tune-3757-get.log 15588 Log file, useful mostly for debugging
Tune-37571-get.log 9311 Log file, useful mostly for debugging
Tune-37573-get.log 8155 Log file, useful mostly for debugging
Tune-37574-get.log 11022 Log file, useful mostly for debugging
Tune-37575-get.log 5786 Log file, useful mostly for debugging
Tune-37576-get.log 9267 Log file, useful mostly for debugging
Tune-37578-get.log 5638 Log file, useful mostly for debugging
Tune-37579-get.log 5316 Log file, useful mostly for debugging
These files should be available for 24 hours.