Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/slide/MMM1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5502-MMM1.ps) >>/Users/jc/w/tmp/Tune-5502-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/slide/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
Coll_55021.log 151273 Log file, useful mostly for debugging
Tune-5502-MMM1.abc 142 ABC music file with the extracted tune(s)
Tune-5502-MMM1.ps 6 PostScript
Tune-5502-MMM1.txt 142 Plain-text file with the extracted tune(s)
Tune-5502-get.log 10500 Log file, useful mostly for debugging
Tune-55020-get.log 5174 Log file, useful mostly for debugging
Tune-55021-get.log 5226 Log file, useful mostly for debugging
Tune-55022-get.log 4528 Log file, useful mostly for debugging
Tune-55024-get.log 11787 Log file, useful mostly for debugging
Tune-55026-CaledonianMusicalRepository.abc 165 ABC music file with the extracted tune(s)
Tune-55026-CaledonianMusicalRepository.ps 6 PostScript
Tune-55026-CaledonianMusicalRepository.txt 165 Plain-text file with the extracted tune(s)
Tune-55026-get.log 9687 Log file, useful mostly for debugging
Tune-55028-get.log 7898 Log file, useful mostly for debugging
These files should be available for 24 hours.