Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Kerr_MM/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7529-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-7529-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr_MM/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_75292.log 434611 Log file, useful mostly for debugging
Coll_75296.log 440208 Log file, useful mostly for debugging
Coll_75297.log 438808 Log file, useful mostly for debugging
Form_75299.log 989 Log file, useful mostly for debugging
Tune-7529-CaledonianCountryDances.abc 163 ABC music file with the extracted tune(s)
Tune-7529-CaledonianCountryDances.ps 6 PostScript
Tune-7529-CaledonianCountryDances.txt 163 Plain-text file with the extracted tune(s)
Tune-7529-get.log 4357 Log file, useful mostly for debugging
These files should be available for 24 hours.