Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Gems/EliasHowe_MusiciansCompanionP3-1844-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5644-EliasHowe_MusiciansCompanionP3-1844-V1.ps) >>/Users/jc/w/tmp/Tune-5644-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gems/EliasHowe_MusiciansCompanionP3-1844-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-5644-EliasHowe_MusiciansCompanionP3-1844-V1.abc 175 ABC music file with the extracted tune(s)
Tune-5644-EliasHowe_MusiciansCompanionP3-1844-V1.ps 6 PostScript
Tune-5644-EliasHowe_MusiciansCompanionP3-1844-V1.txt 175 Plain-text file with the extracted tune(s)
Tune-5644-get.log 4654 Log file, useful mostly for debugging
Tune-56440-get.log 4504 Log file, useful mostly for debugging
Tune-56442-get.log 5169 Log file, useful mostly for debugging
Tune-56443-get.log 9194 Log file, useful mostly for debugging
Tune-56444-get.log 3150 Log file, useful mostly for debugging
Tune-56445-get.log 14733 Log file, useful mostly for debugging
Tune-56446-get.log 4020 Log file, useful mostly for debugging
Tune-56447-get.log 9602 Log file, useful mostly for debugging
Tune-56448-get.log 12863 Log file, useful mostly for debugging
These files should be available for 24 hours.