Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/march/EliasHowe_MusiciansCompanionP1-1842-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7465-EliasHowe_MusiciansCompanionP1-1842-V1.ps) >>/Users/jc/w/tmp/Tune-7465-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/march/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_7465.log 289010 Log file, useful mostly for debugging
Coll_74654.log 252610 Log file, useful mostly for debugging
Form_74656.log 1032 Log file, useful mostly for debugging
Tune-7465-EliasHowe_MusiciansCompanionP1-1842-V1.abc 176 ABC music file with the extracted tune(s)
Tune-7465-EliasHowe_MusiciansCompanionP1-1842-V1.ps 6 PostScript
Tune-7465-EliasHowe_MusiciansCompanionP1-1842-V1.txt 176 Plain-text file with the extracted tune(s)
Tune-7465-get.log 4656 Log file, useful mostly for debugging
Tune-74659-get.log 1434 Log file, useful mostly for debugging
These files should be available for 24 hours.