Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/_/tune.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7979-tune.ps) >>/Users/jc/w/tmp/Tune-7979-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/_/tune.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_79794.log 285735 Log file, useful mostly for debugging
Coll_79797.log 944150 Log file, useful mostly for debugging
Coll_79798.log 144737 Log file, useful mostly for debugging
Tune-7979-get.log 9444 Log file, useful mostly for debugging
Tune-7979-tune.abc 138 ABC music file with the extracted tune(s)
Tune-7979-tune.ps 6 PostScript
Tune-7979-tune.txt 138 Plain-text file with the extracted tune(s)
Tune-79794-get.log 3479 Log file, useful mostly for debugging
Tune-79796-get.log 4598 Log file, useful mostly for debugging
These files should be available for 24 hours.