Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1770/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7411-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-7411-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1770/CaledonianCountryDances.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_74116.log 265212 Log file, useful mostly for debugging
Tune-7411-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-7411-CaledonianCountryDances.ps 6 PostScript
Tune-7411-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-7411-get.log 9816 Log file, useful mostly for debugging
Tune-74110-get.log 13621 Log file, useful mostly for debugging
Tune-74111-get.log 5433 Log file, useful mostly for debugging
Tune-74112-get.log 8631 Log file, useful mostly for debugging
Tune-74114-get.log 5026 Log file, useful mostly for debugging
Tune-74116-get.log 4603 Log file, useful mostly for debugging
Tune-74117-get.log 7721 Log file, useful mostly for debugging
Tune-74118-get.log 3608 Log file, useful mostly for debugging
These files should be available for 24 hours.