I knew it!! I finally know where the Memoirs of a Geisha trailer music came from!
When I first saw the trailer last year, I heard the music and I knew instantly that it had come from The Last Samurai but wasn't sure which track. And at the time I was thinking, "What cheats!" I wonder if The Last Samurai soundtrack copyright holders know about this!
Anyway I was just listening to my iPod when the song came up and it was exactly what I thought! They DID take the music from Samurai. What cheats, gosh. At least take it from a Japanese classical track, right? These people just took it straight from another Japanese-inspired film! What a bummer. I wonder who created the trailer?