pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-84759-10971_.ps) >>/Users/jc/w/tmp/Tune-84759-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/10971_.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_84759.log 472410 Log file, useful mostly for debugging
Tune-84759-10971_.abc 33 ABC music file with the extracted tune(s)
Tune-84759-10971_.ps 6 PostScript
Tune-84759-10971_.txt 33 Plain-text file with the extracted tune(s)
Tune-84759-get.log 3948 Log file, useful mostly for debugging
These files should be available for 24 hours.