Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/EDM/MMM2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5125-MMM2.ps) >>/Users/jc/w/tmp/Tune-5125-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EDM/MMM2.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_51252.log 458411 Log file, useful mostly for debugging
Coll_51257.log 462609 Log file, useful mostly for debugging
Tune-5125-MMM2.abc 140 ABC music file with the extracted tune(s)
Tune-5125-MMM2.ps 6 PostScript
Tune-5125-MMM2.txt 140 Plain-text file with the extracted tune(s)
Tune-5125-get.log 9446 Log file, useful mostly for debugging
Tune-51251-get.log 5367 Log file, useful mostly for debugging
Tune-51252-get.log 4054 Log file, useful mostly for debugging
Tune-51253-get.log 3997 Log file, useful mostly for debugging
Tune-51254-get.log 5660 Log file, useful mostly for debugging
Tune-51255-get.log 9168 Log file, useful mostly for debugging
Tune-51256-get.log 5712 Log file, useful mostly for debugging
Tune-51257-get.log 3690 Log file, useful mostly for debugging
These files should be available for 24 hours.