If Michael McDonald had followed his gut instinct, he may never have written the 1978 Doobie Brothers hit “What a Fool Believes.” The song, which he created with Kenny Loggins, topped the chart the following year and went on to win two Grammys, but as McDonald told Apple Music’s Zane Lowe recently, he almost abandoned the rough version. “The first verse was something I jotted down on an envelope … on a flight from New York back to L.A,” he said. “It just kind of popped in my head … and the piano verse was basically something that I’d been...