pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6842-11491_.ps) >>/Users/jc/w/tmp/Tune-6842-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/11491_.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-6842-11491_.abc 33 ABC music file with the extracted tune(s)
Tune-6842-11491_.ps 6 PostScript
Tune-6842-11491_.txt 33 Plain-text file with the extracted tune(s)
Tune-6842-get.log 3975 Log file, useful mostly for debugging
Tune-68420-get.log 3542 Log file, useful mostly for debugging
Tune-68422-get.log 5200 Log file, useful mostly for debugging
Tune-68423-get.log 5807 Log file, useful mostly for debugging
Tune-68424-get.log 6770 Log file, useful mostly for debugging
Tune-68425-get.log 10852 Log file, useful mostly for debugging
Tune-68426-get.log 8746 Log file, useful mostly for debugging
Tune-68427-get.log 7257 Log file, useful mostly for debugging
Tune-68428-get.log 5445 Log file, useful mostly for debugging
Tune-68429-get.log 3464 Log file, useful mostly for debugging
These files should be available for 24 hours.