Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM4/EliasHowe_MusiciansCompanionP2-1843-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5555-EliasHowe_MusiciansCompanionP2-1843-V1.ps) >>/Users/jc/w/tmp/Tune-5555-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM4/EliasHowe_MusiciansCompanionP2-1843-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-5555-EliasHowe_MusiciansCompanionP2-1843-V1.abc 174 ABC music file with the extracted tune(s)
Tune-5555-EliasHowe_MusiciansCompanionP2-1843-V1.ps 6 PostScript
Tune-5555-EliasHowe_MusiciansCompanionP2-1843-V1.txt 174 Plain-text file with the extracted tune(s)
Tune-5555-get.log 4646 Log file, useful mostly for debugging
Tune-55551-GoldenBookOfFavoriteSongs1.abc 163 ABC music file with the extracted tune(s)
Tune-55551-GoldenBookOfFavoriteSongs1.ps 6 PostScript
Tune-55551-GoldenBookOfFavoriteSongs1.txt 163 Plain-text file with the extracted tune(s)
Tune-55551-get.log 4448 Log file, useful mostly for debugging
Tune-55553-get.log 3867 Log file, useful mostly for debugging
Tune-55554-get.log 5418 Log file, useful mostly for debugging
Tune-55555-get.log 8105 Log file, useful mostly for debugging
Tune-55556-get.log 13087 Log file, useful mostly for debugging
Tune-55557-get.log 5528 Log file, useful mostly for debugging
Tune-55558-get.log 3150 Log file, useful mostly for debugging
Tune-55559-get.log 4565 Log file, useful mostly for debugging
These files should be available for 24 hours.