But on the contrary some games have adaptive music, and interestingly it’s a bit more like John Williams’ view on movie soundtracks : it’s made to adapt to what’s happening in real time. When it’s done right it’s everything but boring.

Elite: Dangerous does this extremely well (IMO it has some of the best sound designs out there, not only music but everything else, too, including the dynamic range). The music is never this generic bombastic horn sections, and it’s different in different environments and situations, always somberly haunting at the edge of consciousness and enhancing, not overpowering, the gameplay.