It looks like that Michael Bay's attempt to movie away from the first trilogy and start somewhat anew extends to the music soundtrack. An image on Facebook suggests that Imagine Dragons is working on the soundtrack for Transformers: Age of Extinction with score composer Steve Jablonsky. On the previous three films, the band was Linkin Park who usually created an end credits track with Jablonsky who also used music ques from the track in the score itself. While not officially confirmed, Imagine Dragon posted an image writing "working on a score for an upcoming movie.." (via TFW2005)