What video game theme/song is really nostalgic for you and you get memories right when you hear it? For me, it has to be Spiral Mountain from Banjo Kazooie:
http://www.youtube.com/watch?v=YU3htIQe6eQ
http://www.youtube.com/v/YU3htIQe6eQ
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http://www.youtube.com/watch?v=YU3htIQe6eQ
http://www.youtube.com/v/YU3htIQe6eQ
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