http://www.great-happy-birthday-ideas.com/how-to-play-happy-birthday-recorder.html
This video teaches you how to play happy birthday on the recorder in the key of G. Here are the notes for those who've asked for them, and I've also added them to the video. I hope this helps!
Ha-ppy Birth-day to You D D E D A F#
Ha-ppy Birth-day to You D D E D A G
Ha-ppy Birth-day Dear [Name] D D (top)D B G F# E
Ha ppy Birth-day to You C C B G A G
Ideally I would have done the video much slower, or repeated the last section a few times, but it's got that many views now that I can't edit it - sorry!
Some of you also stated that the C is wrong, well it sounds Ok to me and that's the way we learnt it at school, Ok so that was a long time ago and I might have forgot LOL.