Steve Jablonsky, who composed the score for the first three Transformers movies, will be returning to compose the score for Transformers 4. Jablonsky has recently created the music for Transformers The Ride and Battleship. Arguably his most popular piece of work is "Arrival to Earth" from Transformers and I'm sure he will continue to compose beautiful scores for the Transformers franchise. Stick around for more TF4 news and rumors here at 'Transformers News'!
Source: Steve Jablonsky Website