Leno and Letterman beat Kimmel in total viewers, but it's close in the key demos
Murray, Letterman's first late-night guest in 1982, nearly started a fire with 30 candles on the celebratory cupcake
Leno had the highest ratings and most viewers but also saw the biggest declines compared to last year
Duo perform three songs for "Late Night with David Letterman," to air on Friday
Exclusive interview with Sandra Bullock's unfaithful husband draws bigger audience than "Tonight Show" and "Late Night"