The entire 164 track Banjo Kazooie soundtrack is available on Bandcamp. Ex-Rare audio maestro Grant Kirkhope put up the whole thing, which includes everything from level themes to cheerful, five-second victory chimes. You can name your price. Go revel in glorious bird/bear nostalgia and the happiest main theme ever.
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Just a small note: Make sure you thank Jon Jaffari aka Jontron, because I feel it's unlikely Grant would have done this if Jon didn't accept and defeat his challenge.