Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Birm2004/IaST-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4837-IaST-abc1.ps) >>/Users/jc/w/tmp/Tune-4837-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Birm2004/IaST-abc1.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-4837-IaST-abc1.abc 150 ABC music file with the extracted tune(s)
Tune-4837-IaST-abc1.ps 6 PostScript
Tune-4837-IaST-abc1.txt 150 Plain-text file with the extracted tune(s)
Tune-4837-get.log 8318 Log file, useful mostly for debugging
Tune-48370-get.log 5224 Log file, useful mostly for debugging
Tune-48371-get.log 7344 Log file, useful mostly for debugging
Tune-48374-get.log 4660 Log file, useful mostly for debugging
Tune-48375-get.log 4205 Log file, useful mostly for debugging
Tune-48377-get.log 3158 Log file, useful mostly for debugging
Tune-48378-get.log 9317 Log file, useful mostly for debugging
Tune-48379-get.log 5433 Log file, useful mostly for debugging
These files should be available for 24 hours.