"Two weeks ago I received a wonderful invitation to be a part of a truly great band," Finn said in a statement. "A few days later I was standing in a room playing music with Fleetwood Mac. It felt fresh and exciting, so many great songs, a spectacular rhythm section and two of the greatest voices ever. Best of all, we sounded good together. It was a natural fit. I can’t wait to play."
He also confirmed the news on Twitter.