Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1779/FARNE_Anonymous2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3961-FARNE_Anonymous2.ps) >>/Users/jc/w/tmp/Tune-3961-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1779/FARNE_Anonymous2.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_39615.log 260447 Log file, useful mostly for debugging
Form_39617.log 823 Log file, useful mostly for debugging
Tune-3961-FARNE_Anonymous2.abc 153 ABC music file with the extracted tune(s)
Tune-3961-FARNE_Anonymous2.ps 6 PostScript
Tune-3961-FARNE_Anonymous2.txt 153 Plain-text file with the extracted tune(s)
Tune-3961-get.log 9789 Log file, useful mostly for debugging
Tune-39610-get.log 4886 Log file, useful mostly for debugging
Tune-39611-get.log 1388 Log file, useful mostly for debugging
Tune-39612-CDfNH1783.abc 146 ABC music file with the extracted tune(s)
Tune-39612-CDfNH1783.txt 146 Plain-text file with the extracted tune(s)
Tune-39612-get.log 3164 Log file, useful mostly for debugging
Tune-39614-get.log 4079 Log file, useful mostly for debugging
These files should be available for 24 hours.