 A multitude of engineers were involved with the process of recording the song, including Doug McKean, Rob Smith, Seth Waldmann, Keith Gretlin, Josh Wilbur, Tom Syrowski, Tatiana Gottwald, Chris Soper, Sam Holland, Chris Holmes, Rouble Kapoor, Wesley Seidman, Janne Hansson, Emily Wright, Marcus Dextegen and Sam Cross. "I Will Be" was mixed by Chris Lord-Alge at Resonale Recording Studios, Burbank, CA, and was assisted by Keith Armstrong and Nik Karpen. For the instrumental, Leon Pendarvis was the conductor and arranger; Martin provided piano, Dr. Luke provided the electric guitar and Yamaha Acoustic guitar, Jack Daley provided the bass and Wolf provided the drums and percussion.
