Though I can't say if it's 100% accurate
I vouch for its accuracy. I even made a few contributions (just some eureka moments I had when playing games) to it.
Now, returning to the topic, I think it would be very difficult to make a library that narrows the type of sounds used in the games of that period. Even restricting myself to just the music played back on real time on the hardware, we can find those are very distinctive:
Crash Bandicoot (1996). The music in this game is a continuation of the "chiptune sensibilities" of the 8-bit and 16-bit eras. I could even say that, from all the games mentioned in this post, the soundtrack to Crash Bandicot is the most videogame-esque. It featured catchy melodies, bouncy rhythms, and a few callbacks to certain 16-bit era sounds, and, although a bit whimsical, it was charming and captured the essence of what came before and what would be produced onwards.
Suikoden II (1998). The soundtrack covers a wide range of styles, going from adrenaline-pumping electronic theme (
Enemy Attack) to militaristic tones (
Suspicion,
March of the King, etc) to sweeping orchestral (
Reminiscence ~Ensemble Version~), to different type of folk-inspired themes, with influence by many different music cultures (
Nahala-Yam Koong, and its sampled Zither and shawms).
Resident Evil 2 (1998). The soundtrack of this game, in comparison with its predecesor, tries to go for a "Hollywood" sound clearly inspired by action film scores of the time. It makes a great use of the limited string, brass and percussion samples to try to get a full orchestral sound.
Silent Hill (1999). Its sonic palette is centered mostly on ambient and industrial sounds, although some pieces contain hints of trip-hop that would be more prevalent later on.
