Try playin' "Louie, Louie" in E, then in F, then in G, then in A, then in C, and so on....

Helps you figure out your chord placement all over the neck...

Key of E => (E, A, B)
Key of F => (F, Bb, C)
Key of G => (G, C, D)
Key of A => (A, D, E)
Key of C => (C, F, G)

and so on...up the neck...