Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1813/MMM1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1169-MMM1.ps) >>/Users/jc/w/tmp/Tune-1169-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1813/MMM1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-1169-MMM1.abc 141 ABC music file with the extracted tune(s)
Tune-1169-MMM1.ps 6 PostScript
Tune-1169-MMM1.txt 141 Plain-text file with the extracted tune(s)
Tune-1169-get.log 3938 Log file, useful mostly for debugging
Tune-11697-2120_Don_Side.abc 618 ABC music file with the extracted tune(s)
Tune-11697-2120_Don_Side.pdf 22593 Portable Data Format
Tune-11697-2120_Don_Side.ps 39220 PostScript
Tune-11697-2120_Don_Side.txt 618 Plain-text file with the extracted tune(s)
Tune-11697-get.log 5367 Log file, useful mostly for debugging
Tune-11698-get.log 3322 Log file, useful mostly for debugging
These files should be available for 24 hours.