Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1798/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3474-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-3474-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1798/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_34741.log 589738 Log file, useful mostly for debugging
Coll_34742.log 285735 Log file, useful mostly for debugging
Find_34743.log 1758 Log file, useful mostly for debugging
Tune-3474-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-3474-CaledonianCountryDances.ps 6 PostScript
Tune-3474-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-3474-get.log 4337 Log file, useful mostly for debugging
Tune-34747-get.log 5403 Log file, useful mostly for debugging
These files should be available for 24 hours.