pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-16822-TeviotBridge.ps) >>/Users/jc/w/tmp/Tune-16822-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/demo/Tunes/TeviotBridge.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-16822-TeviotBridge.abc 391 ABC music file with the extracted tune(s)
Tune-16822-TeviotBridge.ps 35213 PostScript
Tune-16822-TeviotBridge.txt 391 Plain-text file with the extracted tune(s)
Tune-16822-get.log 32079 Log file, useful mostly for debugging
These files should be available for 24 hours.