LOS ANGELES (REUTERS).- Bob Marley’s battle with cancer ended in a Miami hospital 30 years ago on Wednesday, bringing to a premature close the life of reggae music’s most important standard-bearer. His son, David “Ziggy” Marley, who was 12 at the time and has gone on to reggae stardom in his own right, considers the anniversary a day for celebration rather than mourning. “It’s not the happiest day, but we’ve learned to live with it,” he told Reuters on Wednesday. “The actual day is a day of journey. It’s a day of movement. We accept it as that. We’re not here to cry or to be sad. We’re here to celebrate and be happy.” Marley was on hand at the Grammy Museum where an exhibit about his father opened on Wednesday and runs through October 2. The Marley