After 35 years, the four members of ABBA have reunited with a couple of fresh tunes and a world tour in the works! However, the quartet will be replaced on stage by digital avatars of their former selves! Welcome to the 21st century! Also, NBC is set to broadcast a star-studded two-hour tribute special dedicated to the legendary band in December! Meanwhile, “Mamma Mia! Here We Go Again!,” the sequel to the 2008 movie based on the broadway musical, “Mamma Mia,” hits theaters in July! Wow! For a band that vowed to never work together again, they are sure putting in the overtime! Welcome back ABBA!