Just an opinion but 90's was a pretty awful decade for anime but there were a few good soundtracks attached to anime that really weren't that great. In alignment with OP, I'll just share openings.
Maze: The Mega Burst Space Opening (1997) - Kokuu no Meikyuu (short TV edit w/ alternate guitar)
GeoBreeders OVA (1st, 1998) - Rising Soul
There are others with great OPs, some 90's...mostly 70's & 80's but the anime weren't bad; so despite having many titles in my catalogue from time's past...this is all that came to mind. Maybe 'Breeze' from Slayers Try (also 1997)