User blog comment:Cloverfield monster/What songs will you be using in your custom Godzilla: The Game Soundtrack?/@comment-25285745-20150608195947/@comment-25285745-20150610030412

The thing is, Bandai Namco has to pay to use actual music from the films. The rights to the music are sold separately from everything else. Bandai Namco got the rights to Godzilla's theme, the Maser March, and the Monster Zero March, but that's it. They would have had to pay even more for any other tracks, and the game was already on a limited budget.