Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/CDM6/EliasHowe_MusiciansCompanionP1-1842-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5767-EliasHowe_MusiciansCompanionP1-1842-V1.ps) >>/Users/jc/w/tmp/Tune-5767-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CDM6/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
Coll_57675.log 304410 Log file, useful mostly for debugging
Tune-5767-EliasHowe_MusiciansCompanionP1-1842-V1.abc 175 ABC music file with the extracted tune(s)
Tune-5767-EliasHowe_MusiciansCompanionP1-1842-V1.ps 6 PostScript
Tune-5767-EliasHowe_MusiciansCompanionP1-1842-V1.txt 175 Plain-text file with the extracted tune(s)
Tune-5767-get.log 8452 Log file, useful mostly for debugging
Tune-57670-get.log 10003 Log file, useful mostly for debugging
Tune-57671-get.log 4415 Log file, useful mostly for debugging
Tune-57673-get.log 3062 Log file, useful mostly for debugging
Tune-57674-get.log 4414 Log file, useful mostly for debugging
Tune-57675-get.log 7892 Log file, useful mostly for debugging
Tune-57676-get.log 4322 Log file, useful mostly for debugging
Tune-57678-get.log 8402 Log file, useful mostly for debugging
Tune-57679-get.log 5051 Log file, useful mostly for debugging
These files should be available for 24 hours.