Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/mazurka/Kerr_MM3-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3993-Kerr_MM3-V2.ps) >>/Users/jc/w/tmp/Tune-3993-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/mazurka/Kerr_MM3-V2.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_39932.log 459810 Log file, useful mostly for debugging
Coll_39935.log 471010 Log file, useful mostly for debugging
Coll_39937.log 1803559 Log file, useful mostly for debugging
Coll_39938.log 475210 Log file, useful mostly for debugging
Tune-3993-Kerr_MM3-V2.abc 151 ABC music file with the extracted tune(s)
Tune-3993-Kerr_MM3-V2.ps 6 PostScript
Tune-3993-Kerr_MM3-V2.txt 151 Plain-text file with the extracted tune(s)
Tune-3993-get.log 4105 Log file, useful mostly for debugging
Tune-39935-get.log 6160 Log file, useful mostly for debugging
These files should be available for 24 hours.