Click on the Seattle one. I suggest you download the little Live 365 player, its small and easy to use.
Great live ATC feed, usually scans two or three freqs, SEA approach, Departure or SEA center. And you can hear ALL controler transmissions and 90% of the aircraft transmissions.
Nice and clear too. It's 11pm here and its still busy over there
"Alaska 6 cleared direct Mason City"
"Jet Blue 83 passing 5,000, turn left heading 190, maintain 3,000 untill established, cleared ILS 16R approach."
-Clovis
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