Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Kerr_MM/24CountryDances_1771_Thompson.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2962-24CountryDances_1771_Thompson.ps) >>/Users/jc/w/tmp/Tune-2962-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr_MM/24CountryDances_1771_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_29622.log 287140 Log file, useful mostly for debugging
Coll_29625.log 282924 Log file, useful mostly for debugging
Coll_29629.log 558825 Log file, useful mostly for debugging
Tune-2962-24CountryDances_1771_Thompson.abc 169 ABC music file with the extracted tune(s)
Tune-2962-24CountryDances_1771_Thompson.ps 6 PostScript
Tune-2962-24CountryDances_1771_Thompson.txt 169 Plain-text file with the extracted tune(s)
Tune-2962-get.log 9649 Log file, useful mostly for debugging
Tune-29621-get.log 5785 Log file, useful mostly for debugging
Tune-29629-get.log 1403 Log file, useful mostly for debugging
These files should be available for 24 hours.