You can dive pretty deep down the rabbithole here. e.g. I've got a decent stack of albums purely of big-band jazz arrangements of Anime theme/incidental music. Rasmus Faber's Platina Jazz series, Tokyo Brass Style, etc.There's a lot of hidden gems in anime and game OSTs, even if I don't watch anywhere as much anime as I used to. Got into Nujabes because of Samurai Champloo. Cowboy Bebop's OST is timeless. I'm also partial to .Hack SIGN's soundtrack even though I thought the anime was just okay.
::EDIT:: Then there are the multiple recording labels that just publish remix/rearrangement doujin albums of music from the Touhou game series.
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