pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-70628-balkh.ps) >>/Users/jc/w/tmp/Tune-70628-get.log 2>&1" returned status 256
http://www.nigelgatherer.com/tunes/abc/abc8/balkh.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-70628-balkh.abc 492 ABC music file with the extracted tune(s)
Tune-70628-balkh.ps 40722 PostScript
Tune-70628-balkh.txt 492 Plain-text file with the extracted tune(s)
Tune-70628-get.log 4203 Log file, useful mostly for debugging
These files should be available for 24 hours.