Using a Capo (on 2nd fret) to play along with Wonderwall by Oasis. Adding the capo on the 2nd fret raises the pitch of the strings by a whole tone: -

Therefore: E A D G B E becomes F# B E A C# F#

By adding the capo you can play the open chords you already know, but you hear them as: -

Em7 (sounds as F#m7)

G (sounds as A)

Dsus4 (sounds as Esus4)

A7sus4 (sounds as B7sus4)