 Van Halen (qv) made a brief appearance during the "Behind the  Laughter" episode, in which Willie Nelson (qv) states that his  plan to get the Simpsons back together also included getting  Sammy Hagar (qv) to make amends with Van Halen (qv). On March  26, 2004, Van Halen (qv) officially announced that  Sammy Hagar (qv) was once again the lead singer for the band.