OK, more Fabdom: This 1966 Macca composition from "Revolver" was inspired by The Lovin' Spoonful's "Daydream" and "Do You Believe In Magic?". It "radiates optimism and good vibes". Only Paul and Ringo play instruments - John and George add background vocals and handclaps. Used as wake-up music during many space shuttle missions and in various TV commercials.
Yesterday's answer: "Bluer Than Blue" by Michael Johnson. Nothing like a Wendy's Double Cheese and a Frosty to get those muses going!