genius today. the tribute are pouring in. madonna tweeting, devastated. the first concert i ever saw in detroit. even british. he david cam ran tweeting about the british icon. genius is an overused word. but musically and creatively and artistically he was a genius. for someone my age he provided some of the soundtrack of our lives. watching athletes appear in the wonderful olympics to the strains of heroes. martha: the soundtrack of our lives for so many of us over the last couple decade. david bowie, an a trailblazer. we ll have more on his life and