Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM3/EliasHowe_MusiciansCompanionP1-1842-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5718-EliasHowe_MusiciansCompanionP1-1842-V1.ps) >>/Users/jc/w/tmp/Tune-5718-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM3/EliasHowe_MusiciansCompanionP1-1842-V1.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-5718-EliasHowe_MusiciansCompanionP1-1842-V1.abc 174 ABC music file with the extracted tune(s)
Tune-5718-EliasHowe_MusiciansCompanionP1-1842-V1.ps 6 PostScript
Tune-5718-EliasHowe_MusiciansCompanionP1-1842-V1.txt 174 Plain-text file with the extracted tune(s)
Tune-5718-get.log 8314 Log file, useful mostly for debugging
Tune-57180-Garryowen_with_variations_.abc 163 ABC music file with the extracted tune(s)
Tune-57180-Garryowen_with_variations_.ps 6 PostScript
Tune-57180-Garryowen_with_variations_.txt 163 Plain-text file with the extracted tune(s)
Tune-57180-get.log 10332 Log file, useful mostly for debugging
Tune-57181-get.log 5698 Log file, useful mostly for debugging
Tune-57182-get.log 14184 Log file, useful mostly for debugging
Tune-57185-get.log 8603 Log file, useful mostly for debugging
Tune-57186-get.log 9281 Log file, useful mostly for debugging
Tune-57189-get.log 10335 Log file, useful mostly for debugging
These files should be available for 24 hours.