Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1753/24CountryDances_1800_Preston.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-51184-24CountryDances_1800_Preston.ps) >>/Users/jc/w/tmp/Tune-51184-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1753/24CountryDances_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
Tune-51184-083_Hockley_in_the_hole.abc 262 ABC music file with the extracted tune(s)
Tune-51184-083_Hockley_in_the_hole.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-51184-083_Hockley_in_the_hole.ps 33085 PostScript
Tune-51184-083_Hockley_in_the_hole.txt 262 Plain-text file with the extracted tune(s)
Tune-51184-24CountryDances_1800_Preston.abc 165 ABC music file with the extracted tune(s)
Tune-51184-24CountryDances_1800_Preston.ps 6 PostScript
Tune-51184-24CountryDances_1800_Preston.txt 165 Plain-text file with the extracted tune(s)
Tune-51184-get.log 10009 Log file, useful mostly for debugging
These files should be available for 24 hours.