Google embeds a short animated video for John Lennon's "Imagine". After using bigger doodles, image animations, particle simulations and JavaScript games, it's time for video doodles.
Unfortunately, clicking on the YouTube video doesn't send you to the search results page for [John Lennon], but Google used a trick: after playing the video, you're automatically redirected to the search results.
If you don't see the doodle on Google's homepage, go to Google Australia or Google India.