Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1766/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7890-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-7890-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1766/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_78900.log 358242 Log file, useful mostly for debugging
Tune-7890-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-7890-CaledonianCountryDances.ps 6 PostScript
Tune-7890-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-7890-get.log 9066 Log file, useful mostly for debugging
Tune-78900-get.log 3598 Log file, useful mostly for debugging
Tune-78902-get.log 9494 Log file, useful mostly for debugging
Tune-78904-get.log 3690 Log file, useful mostly for debugging
Tune-78906-get.log 3558 Log file, useful mostly for debugging
Tune-78907-get.log 6628 Log file, useful mostly for debugging
Tune-78908-get.log 5696 Log file, useful mostly for debugging
Tune-78909-get.log 4588 Log file, useful mostly for debugging
These files should be available for 24 hours.