Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM1/EliasHowe_MusiciansCompanionP2-1843-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7772-EliasHowe_MusiciansCompanionP2-1843-V1.ps) >>/Users/jc/w/tmp/Tune-7772-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM1/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-7772-EliasHowe_MusiciansCompanionP2-1843-V1.abc 174 ABC music file with the extracted tune(s)
Tune-7772-EliasHowe_MusiciansCompanionP2-1843-V1.ps 6 PostScript
Tune-7772-EliasHowe_MusiciansCompanionP2-1843-V1.txt 174 Plain-text file with the extracted tune(s)
Tune-7772-get.log 4646 Log file, useful mostly for debugging
Tune-77720-get.log 1430 Log file, useful mostly for debugging
Tune-77723-get.log 4678 Log file, useful mostly for debugging
Tune-77726-get.log 3576 Log file, useful mostly for debugging
Tune-77727-get.log 4174 Log file, useful mostly for debugging
Tune-77729-get.log 7000 Log file, useful mostly for debugging
These files should be available for 24 hours.