(I don't own this song!)
I love this song, but I could only find one tab for this song on the internet, but 
it had tricky chords and it wasn't really detailed. So, here you go! 

Intro: D, A, Em, G x2

Verse:
D               A
Joyful, joyful, we adore You
Em             G
God of glory, Lord of love
D                   A
Hearts unfold like flowers before You
Em             G
Opening to the sun above

D, A, Em, G

D                A
Joyful, joyful, we adore You
Em             G
God of glory, Lord of love
D                   A
Hearts unfold like flowers before You
Em             G
Opening to the sun above

Bridge:
Em                 G
Melt the clouds of sin and sadness
Em                G
Drive the dark of doubt away

Chorus:
A                   Em        G
Joyful, joyful, we adore You---
A                          Em         G
Hearts unfold like flowers before You---
A                   Em    
Joyful, joyful, we adore You
G          D
Joyful, we adore You

A, Em, G

Verse2:
D                    A
All Your works with joy surround You
Em               G
Earth and Heaven reflect Your ways
D                A
Stars and angels sing around You
Em              G
Center of unbroken praise

Bridge:
Em                 G
Melt the clouds of sin and sadness
Em                  G
Drive the dark of doubt away

Chorus
A                   Em        G
Joyful, joyful, we adore You---
A                          Em         G
Hearts unfold like flowers before You---
A                   Em    
Joyful, joyful, we adore You
G          D
Joyful, we adore You

A, Em, G


A Capella: 
God, our Father
Christ, our Brother
All who live in love are thine
Teach us how to love each other
Lift us to the joy divine

Oh, God, our Father
Christ, our Brother
All who live in love are thine
Teach us how to love each other
D