Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1826/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8234-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-8234-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1826/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_82342.log 149962 Log file, useful mostly for debugging
Coll_82345.log 298811 Log file, useful mostly for debugging
Tune-8234-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-8234-CaledonianCountryDances.ps 6 PostScript
Tune-8234-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-8234-get.log 26504 Log file, useful mostly for debugging
Tune-82340-get.log 4553 Log file, useful mostly for debugging
Tune-82341-get.log 10058 Log file, useful mostly for debugging
Tune-82343-get.log 5272 Log file, useful mostly for debugging
Tune-82346-get.log 1412 Log file, useful mostly for debugging
Tune-82347-get.log 7461 Log file, useful mostly for debugging
Tune-82348-get.log 3588 Log file, useful mostly for debugging
These files should be available for 24 hours.