Christine McVie

"See you on the other side, my love," she says. "Don't forget me."

"She was the best musician anyone could have in their band and the best friend anyone could have in their life," her bandmates shared.

"She was truly one-of-a-kind, special and talented beyond measure," the band wrote in a statement.

There have been more than 40 of these outside projects, which deepen and add to the band's legacy.