Template:Ratings Michael Salvatori is an American producer and composer of music. He has worked closely with Martin O'Donnell to produce the music of the Halo universe. His extensive involvement has included work on Halo: Combat Evolved and Halo 2, as well as deep cooperation in the Halo: Original Soundtrack, Halo 2: Original Soundtrack and the Halo 3 Original Soundtrack. He also helped score and produce the Halo 3: ODST Original Soundtrack alongside Martin O'Donnell.