(Boy, this one here pulls the juice out of you.)

At the end of my rainbow
I seek no golden prize
For the key to my kingdom
Is the glow in your eyes

Gain and power and riches
Are thrills I'll never miss
For the key to my kingdom
Is the thrill of your kiss

Baby, I have more
Than fame and fortune
Every time I hold your hand
And my darling
When our lips meet
All the world's at my command
[ Lyrics from: http://www.lyricsfreak.com/b/bb+king/key+to+my+kingdom_20010667.html ]
Yeah, if you ever
Ever should leave me
My world would tumble down
Because you're the key to my kingdom
And your love is my crown

Oh I have more than fame and fortune
Every time I hold your hand
And my darling
When our lips meet
All the world's at my command

Yes, yes, if you ever
Ever should leave me
All of my world would tumble down
For you're the key to my kingdom
And your love is my crown
Yeah, you're the key to my kingdom
And your love is my crown
Yeah, you're the key to my kingdom
And your love, your love is my crown