ABBA are releasing a new song that’s actually an old song. They will release a deluxe edition of their 1981 album, “The Visitors,” on April 23. It will include a previously unreleased song called “From A Twinkling Star To A Passing Angel.” ABBA have not released a new song in 18 years, when they put unreleased tracks on their “Thank You For The Music” boxed set.