A feature of Adon Olam, which wraps up the Shabbat morning service, is its adaptability - you can sing it to all sorts of tunes. Greensleeves and Scarborough Fair were two we used at school. But for sheer ingenuity, you'd be pressed to match the version which brought West London Synagogue's 175th anniversary service to a swinging end last Shabbat; led by Maya Levy, who holds the post of community musician, it was set to Pharrell Williams's hit, Happy.