Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book29/24CountryDances_1791_Thompson.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6418-24CountryDances_1791_Thompson.ps) >>/Users/jc/w/tmp/Tune-6418-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book29/24CountryDances_1791_Thompson.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_64181.log 637611 Log file, useful mostly for debugging
Coll_64183.log 640412 Log file, useful mostly for debugging
Tune-6418-24CountryDances_1791_Thompson.abc 168 ABC music file with the extracted tune(s)
Tune-6418-24CountryDances_1791_Thompson.ps 6 PostScript
Tune-6418-24CountryDances_1791_Thompson.txt 168 Plain-text file with the extracted tune(s)
Tune-6418-get.log 4479 Log file, useful mostly for debugging
Tune-64180-get.log 4024 Log file, useful mostly for debugging
Tune-64183-get.log 4865 Log file, useful mostly for debugging
Tune-64186-get.log 10565 Log file, useful mostly for debugging
These files should be available for 24 hours.