Listen to the sound clip Strings. from Avengers: Age of Ultron Trailer Soundboard: Strings. Strings. This sound is from Avengers: Age of Ultron Trailer Soundboard Avengers: Age of Ultron Trailer - An Epic Marvel Cinematic Universe Adventure The year was 2015, and Marvel Cinematic Universe fans worldwide eagerly anticipated th… Go to the full soundboardwith more sound clips Search