The album’s even split between Buckingham and Nicks songs suggests an effort to maintain some equilibrium.

“It’s a tenuous thing, certainly,” says Buckingham, tossing a note of caution into what’s being generally portrayed as an upbeat situation. “There are large egos flying around all over the place.”

“Lindsey and I are dramatic,” Nicks says in a separate interview. “We argue a lot; we don’t agree on a lot of things; but what we do agree on is that we love to sing together. . . . We are really trying to appreciate this opportunity that we have and not get stuck in stupid, dumb arguments that mean nothing to anybody. I’ve always been open to Fleetwood Mac whenever it is serious, whenever it wants to do something.”

Nicks is hoping the tour, which includes 36 arena dates, will continue for a year and a half, with another album to follow.

Buckingham calculates that some of the mid-’70s fans are now literally that — in their mid-70s. But he’s ready to keep this rolling.

“I hope it goes on,” he says, “because it’s been a long time getting to this, and I feel that we really got to some things on a musical level that are fresh. . . . I would be completely happy to continue with this, never to pursue anything solo again, because it’s a hell of a lot easier.”

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