Deadman (Neil Young)
Requiem for a dream (Clint Mansell)
Ghost in the shell (Kenji Kawai)
Naqoyqatsi (Philip Glass)
Le fabuleux destin d'Amélie Poulain (Yann Tiersen)
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If I was to place a single soundtrack on top of all, it would be The Lord of the Rings: The Fellowship of the Ring (Howard Shore).
It is the most solid soundtrack I've ever heard and one of the best (if not the best).
Other soundtracks I love: The Fifth Element (Eric Serra) The Fountain (Clint Mansell) Gladiator (Hans Zimmer, Lisa Gerrard and Klaus Badelt) American Beauty (Thomas Newman) How to Train Your Dragon (John Powell) The Village (James Newton Howard)