Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM2/EliasHowe_MusiciansCompanionP1-1842-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6827-EliasHowe_MusiciansCompanionP1-1842-V2.ps) >>/Users/jc/w/tmp/Tune-6827-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM2/EliasHowe_MusiciansCompanionP1-1842-V2.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-6827-EliasHowe_MusiciansCompanionP1-1842-V2.abc 174 ABC music file with the extracted tune(s)
Tune-6827-EliasHowe_MusiciansCompanionP1-1842-V2.ps 6 PostScript
Tune-6827-EliasHowe_MusiciansCompanionP1-1842-V2.txt 174 Plain-text file with the extracted tune(s)
Tune-6827-get.log 13538 Log file, useful mostly for debugging
Tune-68273-24CountryDances_1748_TDavis.abc 164 ABC music file with the extracted tune(s)
Tune-68273-24CountryDances_1748_TDavis.ps 6 PostScript
Tune-68273-24CountryDances_1748_TDavis.txt 164 Plain-text file with the extracted tune(s)
Tune-68273-get.log 4346 Log file, useful mostly for debugging
Tune-68274-get.log 5154 Log file, useful mostly for debugging
Tune-68277-get.log 7200 Log file, useful mostly for debugging
Tune-68278-get.log 10817 Log file, useful mostly for debugging
These files should be available for 24 hours.