pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-22015-13322.ps) >>/Users/jc/w/tmp/Tune-22015-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Button_Whitaker/SelectionOfDancesReelsAndWaltzes/13322=LORD_CATHCARTS_WELCOME_TO_SCOTLAND.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-22015-13322.abc 1431 ABC music file with the extracted tune(s)
Tune-22015-13322.ps 41207 PostScript
Tune-22015-13322.txt 1431 Plain-text file with the extracted tune(s)
Tune-22015-get.log 4933 Log file, useful mostly for debugging
These files should be available for 24 hours.