On February 12, 2004, just two days before Weezer's twelfth anniversary, Rivers Cuomo and Matt Sharp ended their public separation when they reunited onstage. Rivers sat in during a Sharp solo show at Cal State Fullerton. Sharp and Cuomo played four songs together: the Sharp/Cuomo collaborations "Mrs. Young" and "Time Song," and the Weezer tunes "Say It Ain't So" and "Undone." At the show, Sharp announced that he and Cuomo would be working on a collaborative record together. Yet later that year, he announced on his website that although they had come up with "15 or 16 new song ideas, some good, some not so good" for their new album, their "special brand of disfunctionality" kept them from ever finishing the project.