Doreen Tracey, one of the original Mouseketeers on Disney’s popular after-school program “The Mickey Mouse Club” and later an associate of avante-garde composer and musician Frank Zappa, has died. She was 74. Tracey, who long described herself as the “black sheep” of the 1950s children’s show, died Wednesday while being treated for pneumonia at a hospital in Thousand Oaks. A bubbly child and Type A personality, Tracey was featured on “The Mickey Mouse Club” during the entirety of its original 1955-59 run on ABC. The show lived on in syndication and she maintained a lifelong association with Disney, appearing in...