Not really an Eagles fan, but the 1st thing I thought of when I saw the topic was "Life in the Fast Lane". Actually, I'm a big Joe Walsh fan so that intro doesn't really count as "Eagles".
I'll vote "Unchained" as the best.
Oh, and special Lifetime Achievement goes to The Beatles, who have too many to mention...but I'll throw out 3. "Helter Skelter" (1st heavy metal intro?), "Eight Days a Week" (first fade up intro?), and "I Feel Fine" (first use of feedback?), and I'll add one more...."Taxman" (love the thick English 1, 2, 3, 4...1, 2)
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[This message has been edited by Aust Ag (edited 6/9/2014 6:05p).]