Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book39/MMM2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-67836-MMM2.ps) >>/Users/jc/w/tmp/Tune-67836-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book39/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_67836.log 282925 Log file, useful mostly for debugging
Tune-67836-MMM2.abc 143 ABC music file with the extracted tune(s)
Tune-67836-MMM2.ps 6 PostScript
Tune-67836-MMM2.txt 143 Plain-text file with the extracted tune(s)
Tune-67836-get.log 9221 Log file, useful mostly for debugging
These files should be available for 24 hours.