pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-66187-tb13.ps) >>/Users/jc/w/tmp/Tune-66187-get.log 2>&1" returned status 256
http://www.nigelgatherer.com/tunes/abc/tb13.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
Form_66187.log 860 Log file, useful mostly for debugging
Tune-66187-get.log 4191 Log file, useful mostly for debugging
Tune-66187-tb13.abc 307 ABC music file with the extracted tune(s)
Tune-66187-tb13.ps 35016 PostScript
Tune-66187-tb13.txt 307 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.