Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/mazurka/_.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-19384-_.ps) >>/Users/jc/w/tmp/Tune-19384-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/mazurka/_.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_19384.log 755816 Log file, useful mostly for debugging
Form_19384.log 1044 Log file, useful mostly for debugging
Tune-19384-_.abc 141 ABC music file with the extracted tune(s)
Tune-19384-_.ps 6 PostScript
Tune-19384-_.txt 141 Plain-text file with the extracted tune(s)
Tune-19384-get.log 3910 Log file, useful mostly for debugging
These files should be available for 24 hours.