pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-63478-tb20.ps) >>/Users/jc/w/tmp/Tune-63478-get.log 2>&1" returned status 256
http://nigelgatherer.com/tunes/abc/tb20.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_63478.log 794 Log file, useful mostly for debugging
Tune-63478-get.log 4019 Log file, useful mostly for debugging
Tune-63478-tb20.abc 641 ABC music file with the extracted tune(s)
Tune-63478-tb20.ps 42819 PostScript
Tune-63478-tb20.txt 641 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.