Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book39/24CountryDances_1800_Preston.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5099-24CountryDances_1800_Preston.ps) >>/Users/jc/w/tmp/Tune-5099-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book39/24CountryDances_1800_Preston.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_50990.log 26220 Log file, useful mostly for debugging
Tune-5099-24CountryDances_1800_Preston.abc 167 ABC music file with the extracted tune(s)
Tune-5099-24CountryDances_1800_Preston.ps 6 PostScript
Tune-5099-24CountryDances_1800_Preston.txt 167 Plain-text file with the extracted tune(s)
Tune-5099-get.log 4458 Log file, useful mostly for debugging
Tune-50994-get.log 3820 Log file, useful mostly for debugging
Tune-50995-William_Clarke_MS_1770.abc 160 ABC music file with the extracted tune(s)
Tune-50995-William_Clarke_MS_1770.txt 160 Plain-text file with the extracted tune(s)
Tune-50995-get.log 3406 Log file, useful mostly for debugging
These files should be available for 24 hours.