pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-31427-north1.ps) >>/Users/jc/w/tmp/Tune-31427-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/bath.ac.uk/~exxhf/music/north1

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_31427.log 151277 Log file, useful mostly for debugging
Tune-31427-get.log 4262 Log file, useful mostly for debugging
Tune-31427-north1.abc 130 ABC music file with the extracted tune(s)
Tune-31427-north1.ps 32229 PostScript
Tune-31427-north1.txt 130 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.