Rex!

Elvis should absolutely be forever crowned the King of Rock & Roll.

He was the first megastar in that crazy genre called rock and roll, and he's still universal. Even today, anyone in the world with a modicum of pop culture in their head knows Elvis. Can that be said of his peers; will that be said of his followers? "King" is the perfect title for him, since it's an antiquated role (see Kingdom, United) and one that was never based on merit. Sure, he didn't write his own tunes like say, Chuck Berry. Doesn't matter. King-liness is as much a state of mind -- his own and his people's, and Elvis had it. He embraced the role, and even went he went down in flames, his people loved him. Hordes of minions worshiped him, but even those who thought he was a joke -- if they like their rock and roll -- admire his place in musical history.

Kings have elaborate, costly, wastefully opulent castles. (See the Jungle Room at Graceland.) Kings have stately queens, who, only after the King has passed on, make Naked Gun! movies where they employ physical comedy and beaver jokes. Maybe the Beatles were some kind of Parliament (but wait, where does that leave Parliament?), the Clash were the Czars of Rock, and perhaps latter day leaders are mere Presidents (excepting Prince & the Boss, who have their own titles), but there can be only one King, and that's E-L-V-I-S. Love that guy.