Pre PlayStation1 had the best musical themes and music since composers had to rely heavily on the melodic structures rather than on sound. Since engines can handle heavy processing and are extremely powerful, full scale orchestras can be used to create dynamic performances. This allows composers not to focus so heavily on melodies or harmonic structures to create memorable scores since the sound quality is extremely good.
Lately games mimic movie structures and follow film scoring techniques which support the visuals rather than overpower them; as well as focusing too much on the sound production. Back when CG wasn't developed enough, music had to enhance the story by creating strong melodic themes to make up for the lack of visuals. When visuals are the main focus then music cannot overpower it, only support it.
I miss the SNES simple yet powerful themes, especially from FFIV and FFVI. But I know that not all games follow film music methods, many simpler consoles - Wii, Mobile, DS - have great simple melodies similar to the Pre-playstation days.
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