pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-57160-BonnyBonnyBroome.ps) >>/Users/jc/w/tmp/Tune-57160-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Vintage/program/20170916/BonnyBonnyBroome.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-57160-BonnyBonnyBroome.abc 2986 ABC music file with the extracted tune(s)
Tune-57160-BonnyBonnyBroome.ps 36254 PostScript
Tune-57160-BonnyBonnyBroome.txt 2986 Plain-text file with the extracted tune(s)
Tune-57160-get.log 6533 Log file, useful mostly for debugging
These files should be available for 24 hours.