Great song! :)

E (022100@1)                                BWho (x2444x@1)would have known that I could like a boy like you
C#m (x13321@4)                      ATall (x02220@1)dark and Slytherin, what's a girl to do?
E (022100@1)                      BYou (x2444x@1)used your Nimbus to sweep me off my feet.
C#m (x13321@4)                      ABut (x02220@1)now without you by my side I feel incomplete.

E (022100@1)                        BSlytherin (x2444x@1)and Gryffindor, parted by the sorting hat
C#m (x13321@4)                     AFrom (x02220@1)rival houses boy but we don't have to be like that
E (022100@1)                         BCause (x2444x@1)you've confundesed me, and now I'm feeling well
C#m (x13321@4)                 ALike (x02220@1)this is magical, I'm under your spell.

E (022100@1)               BI (x2444x@1)never thought you'd be in my life
C#m (x13321@4)                     ATwo (x02220@1)different worlds that we let collide
E (022100@1)                   Band (x2444x@1)it will never be the way it was before
C#m (x13321@4)                           ACause (x02220@1)baby I'm a Slytherin and girl you are a Gryffindor

(Repeat pattern for the rest of the song)