Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM3/EliasHowe_MusiciansCompanionP2-1843-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5722-EliasHowe_MusiciansCompanionP2-1843-V1.ps) >>/Users/jc/w/tmp/Tune-5722-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM3/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-28343-Tune-57224-Pioneer.abc 170 ABC music file with the extracted tune(s)
Tune-28343-Tune-57224-Pioneer.ps 6 PostScript
Tune-28343-Tune-57224-Pioneer.txt 170 Plain-text file with the extracted tune(s)
Tune-5722-EliasHowe_MusiciansCompanionP2-1843-V1.abc 174 ABC music file with the extracted tune(s)
Tune-5722-EliasHowe_MusiciansCompanionP2-1843-V1.ps 6 PostScript
Tune-5722-EliasHowe_MusiciansCompanionP2-1843-V1.txt 174 Plain-text file with the extracted tune(s)
Tune-5722-get.log 19474 Log file, useful mostly for debugging
Tune-57221-get.log 9135 Log file, useful mostly for debugging
Tune-57222-get.log 4643 Log file, useful mostly for debugging
Tune-57224-get.log 18226 Log file, useful mostly for debugging
Tune-57225-get.log 3514 Log file, useful mostly for debugging
Tune-57226-get.log 5093 Log file, useful mostly for debugging
Tune-57227-GoldenBookOfFavoriteSongs2.abc 163 ABC music file with the extracted tune(s)
Tune-57227-GoldenBookOfFavoriteSongs2.ps 6 PostScript
Tune-57227-GoldenBookOfFavoriteSongs2.txt 163 Plain-text file with the extracted tune(s)
Tune-57227-get.log 4448 Log file, useful mostly for debugging
Tune-57229-get.log 5605 Log file, useful mostly for debugging
These files should be available for 24 hours.