Fleetwood Mac is having a moment.
Decades after its late-1970s commercial peak, the band can still fill arenas around the world with fans eager to relive memories indelibly linked to old hits like “Dreams” and “Go Your Own Way.”
Yet Fleetwood Mac’s polished pop-rock has also become a touchstone for younger, hipper acts such as Jenny Lewis and One Direction. In 2011, the television show “Glee” built an episode around the group’s music; the next year it was the subject of a high-profile tribute album.
So it’s not hard to understand Christine McVie’s decision, announced in January, to rejoin the band after retiring...