By the way, if you're looking for the very best OST musics in all kind, try these names, you'll find jewels :
- Yoko Kanno ( a true genius, she worked on movies, animés and video games soundtracks such as cowboy bebop, macross frontier, wolf's rain, escaflowne, ghost in the shell, uncharted waters etc... she has lot of classical musics, many very studied, complex and progressive pieces ).
- Yasunori Mitsuda ( to put simply, the king of jrpg's music to me, he made the OST of the fantastic xenogears, chrono trigger/cross and also kid icarus, inazuma eleven, radical dreamers, shadow hearts, xenosaga I, and he also collaborated to many pieces of xenoblade 1 & 2 and more... ).
- Yoko Shinomura ( as mitsuda is the king, she's just the queen with OST like xenoblade 1 & 2, legend of mana, kingdom heart, street fighter 2, parasite eve, last ranker, radiant historia, final fantasy 15, super smash bros brawl, super mario RPG... she's incredible ^^ ).
- Nobuo Uematsu ( no need to mention the well know uematsu, popular for his works on most final fantasy games, the last story, lost odyssey, blue dragon, ergheiz etc... ).
- Koji Kondo ( kondo is also very popular with most zelda and mario games, starfox 64, pilotwings.. ).
- Jeremy Soule ( pretty good OST like secret of evermore, baldur's gate dark alliance, neverwinter nights, morrowing/oblivion/skyrim etc.. ).
- David Wise ( the famous composer of the incredible donkey kong country trilogy on the snes <3 but also diddy kong racing, donkey kong tropical freeze, starfox adventure, yooka laylee.. )
- Motoi Sakuraba ( lot of pretty good OST from him, such as the series of valkyrie profile, star ocean, shining force, baten kaitos and most of "tales of" games ).
- Noryuki Iwadare ( less famous but i appreciate his works alot... especially on the series of grandia, lunar, langrisser, growlanser and radiata stories ).
- Kenji Yamamoto ( most metroid games, dragon ball Z ultimate battle 22, super smash bros wii U, donkey kong country returns, punch out.. ).
- Grant Kirkhope ( pretty cool stuff with banjo kazooie/tooie, perfect dark, goldeneye, donkey kong 64 etc... ).
- Yuki Kajiura ( she made lot of very good and epic OST of animés like sword art online, madoka magica, tsubasa chronicles, mai hime, noir, chrono crusade, pandora hearts, the garden of sinners and in some games like xenosaga, and most HACK games, she's also the principal composer of the famous group "kalafina", if you don't know what i mean, google it ).
And less significant but still good :
- Hiroyuki Sawano ( known for his OST of attacks on titan, seven deadly sins, kill la kill and Xenoblade X ).
- Harry Gregson Williams ( he's mostly into movies musics but he also made the OST of most metal gear solid, which are pretty good ).
- Yutaka Minobe ( the composer of the the magical skies of arcadia and also panzer dragoon ).
- Masato Nakamura ( sonic on genesis ).
- Hiroki Kikuta ( secret of mana 1 & 2, koudelka )
- Michiru Yamane ( most castlevania games and suikoden 3 & 4 )
Also, i'm not in cinema at all but if you like epic musics, look for Hans Zimmer, Vangelis and Thomas Bergersen ^^