Taylor Swift came about simply because he was lucky enough to "get the call".MORE: Taylor Swift's fans convinced she's dropped new music clues in rare home videoThe singer - who will appear on Taylor's new album Red (Taylor's Version) and Adele's upcoming album 30 - revealed that there is very little he can say about the tracks themselves but that it was very "cool'.WATCH: See GMA's announcement of Taylor Swift's exciting new project"They called and I answered," he told press at the 2021 Country