So, it's the very famous song of Otis Redding : Knock on Wood.
I don't write the little variations, only the basic tab :

Intro & Chorus :

    G   |-----------222222244444447---4444444-|
    D   |22222225-----------------------------|
    A   |-------------------------------------|
    E   |-------------------------------------|

And sometimes he plays in the end :

    G   |-7--4--2-------|
    D   |----------5----|
    A   |---------------|
    E   |---------------|

Then, verse A :

    G   |----11-------|
    D   |-------14-11-|
    A   |-12----------|
    E   |-------------|

Verse B :

    G   |-------------|
    D   |----11-------|
    A   |-------14-11-|
    E   |-12----------|

Bridge :

    G   |----------------------------|
    D   |----------------------------|
    A   |------------------------3-2-|
    E   |222222224444444455555555----|

Outro : Verse A, Verse B, Verse A, Verse B, 'till the end.

So, this is my first tab. Sorry for the mistakes of language, i'm french ^^
Please rate ! And good luck !