Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM4/BotCDaSS.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-43097-BotCDaSS.ps) >>/Users/jc/w/tmp/Tune-43097-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM4/BotCDaSS.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_43097.log 566821 Log file, useful mostly for debugging
Tune-43097-24CountryDances_1805_Preston.abc 164 ABC music file with the extracted tune(s)
Tune-43097-24CountryDances_1805_Preston.pdf 2217 Portable Data Format
Tune-43097-24CountryDances_1805_Preston.ps 6 PostScript
Tune-43097-24CountryDances_1805_Preston.txt 164 Plain-text file with the extracted tune(s)
Tune-43097-BotCDaSS.abc 144 ABC music file with the extracted tune(s)
Tune-43097-BotCDaSS.ps 6 PostScript
Tune-43097-BotCDaSS.txt 144 Plain-text file with the extracted tune(s)
Tune-43097-get.log 9435 Log file, useful mostly for debugging
These files should be available for 24 hours.