This is what you need to do to get it to work:

0. Use fix close quote on bit.ly redirect if you are using the parent comment...

  javascript:(function(){document.body.appendChild(document.createElement("script")).src="http://bit.ly/googlebeat"})()

1. Load Google Translate: http://translate.google.com

2. Load the bookmarklet.

3. Click the new buttons at the bottom of the page.

See the howto from the gist: https://gist.github.com/721554#file_how_to.txt

Thanks for the response. I got it! But the play button doesn't seem to work...not a big deal.

A tip for composers, use commas and periods for rests

It doesn't work because Firefox doesn't support mp3 format through <audio> html tag.

This script supports only Safari and Chrome by now.