pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6345-tb16.ps) >>/Users/jc/w/tmp/Tune-6345-get.log 2>&1" returned status 256
http://nigelgatherer.com/tunes/abc/tb16.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-6345-get.log 4167 Log file, useful mostly for debugging
Tune-6345-tb16.abc 357 ABC music file with the extracted tune(s)
Tune-6345-tb16.ps 35656 PostScript
Tune-6345-tb16.txt 357 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.