The return of Mumfordmania is imminent, as the British quartet have been road-testing an album’s worth of new material ever since the release of their 2009 breakout debut, Sigh No More. Most notably, “Home” and “Lover’s Eyes” picked up on the promise of early material by offering plenty of sing-along arrangements and evocative moments primed for an even wider audience. Now comes “Ghosts” — according to Ben Lovett, or “Ghosts That We Knew,” if it’s up to Marcus Mumford — via a recent live performance on Radio 104.5. By the looks of things, no sophomore slump is in sight. Hear the tune above.