Music from Beginning of Many Anime Trailers

In the mid 1990s, I used to buy a bunch of anime tapes... I believe the company releasing them was called "Manga" (had a red and black logo that looked like a chinese character if i remember correctly)... they always had these trailers at the beginning of the tapes which showed about 10 different anime movies that they were releasing, and always had awesome music associated with them. Was wondering if anyone could tell me where I could find that music, or what the name of it is. Thanks guys!

Some of the movies included were things like 8 man after, patlabor, garaga, demon city shinjuku... can't remember others