FILE - Abba, from left, Anni-Frid Lyngstad, Agnetha Foltskog, Benny Andersson and Bjorn Ulvaeus perform at United Nations General Assembly, in New York, during taping of NBC-TV Special, "The Music for UNICEF concert" on Jan. 9, 1979. ABBA is releasing its first new music in four decades, along with a concert performance that will see the “Dancing Queen” quartet going entirely digital. The forthcoming album “Voyage," to be released Nov. 5, is a follow-up to 1981's “The Visitors,” which until now had been the swan song of the Swedish supergroup. (AP Photo/Ron Frehm, File)