Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book01/EliasHowe_MusiciansCompanionP2-1843-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4336-EliasHowe_MusiciansCompanionP2-1843-V1.ps) >>/Users/jc/w/tmp/Tune-4336-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book01/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
Coll_43365.log 95365 Log file, useful mostly for debugging
Coll_43368.log 841750 Log file, useful mostly for debugging
Tune-4336-EliasHowe_MusiciansCompanionP2-1843-V1.abc 177 ABC music file with the extracted tune(s)
Tune-4336-EliasHowe_MusiciansCompanionP2-1843-V1.ps 6 PostScript
Tune-4336-EliasHowe_MusiciansCompanionP2-1843-V1.txt 177 Plain-text file with the extracted tune(s)
Tune-4336-get.log 4662 Log file, useful mostly for debugging
Tune-43360-get.log 3398 Log file, useful mostly for debugging
Tune-43363-get.log 3398 Log file, useful mostly for debugging
Tune-43364-get.log 6725 Log file, useful mostly for debugging
These files should be available for 24 hours.