Johnny MathisMathis talks about his fitness regimen, what music is most important to him, and his album with Chic. Rachael YamagataShe's written with Ryan Adams and Mandy Moore, but one of her most important songs found her on a mountain. Dhani HarrisonOn Tom Petty, being an honorary Heartbreaker/Wilbury, and releasing his first solo album at 39. Hamell on TrialIf Woody Guthrie was around in the age of Trump, he might sound like this guy. Steve EarleEarle on the true meaning of "outlaw" country, and why he wrote "Guitar Town." Booker T. JonesThe Stax legend on how he cooked up "Green Onions," the first time he and Otis Redding saw hippies, and if he'll ever play a digital organ.