Before Christine McVie rejoined Fleetwood Mac in 2014 after a 16-year hiatus, she reconvened with guitarist Lindsey Buckingham, bassist and ex-husband John McVie and drummer Mick Fleetwood in the studio. Buckingham was working on a solo album and, before rehearsals began for Fleetwood Mac’s upcoming tour, the four — sans Stevie Nicks — played around with some songs. “We didn’t have an idea what it was going to be, we just wanted to welcome her back,” Buckingham says. “Less than a week in we were like, ‘Oh, my god, this is better than it’s ever been.’ ”