The great Mel Knight, who brought us last year's mega-hit classic barbershop "I Don't Know Why (I Just Do)," turns to the '60s radio hit "Daydream." You know you know it; how many songs feature whistling on the bridge? Earworm warning: this groovy little number will get stuck in your head, and you will be singing it for days. Learning track by Tim Waurick, natch.