Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/tune/band8.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2254-band8.ps) >>/Users/jc/w/tmp/Tune-2254-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/tune/band8.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_22541.log 285735 Log file, useful mostly for debugging
Coll_22548.log 281520 Log file, useful mostly for debugging
Find_22544.log 1550 Log file, useful mostly for debugging
Tune-2254-band8.abc 142 ABC music file with the extracted tune(s)
Tune-2254-band8.ps 6 PostScript
Tune-2254-band8.txt 142 Plain-text file with the extracted tune(s)
Tune-2254-get.log 3959 Log file, useful mostly for debugging
These files should be available for 24 hours.