It starts with the water and you hear the guitars louder and louder in this way: 
 
Riff 1: 
e|-------------------------------------------------| 
B|-------------------------------------------------| 
G|-------------5555-4444--------------5555--4--4-4-| 
D|-2222--5555--3333-3333--2222--5555--3333--2--2-2-| 
A|-0000--3333-------------0000--3333---------------| 
E|-------------------------------------------------| 
 
Play the whole thing 2                   |---------| 
times and the second                     |---------| 
guitars come in like this here:          |---------| 
second guitar:                           |---------| 
                                         |--2--2-2-| 
                                         |--0--0-0-| 
 
Another 2 times with riff 1 but not the second guitar. Then this starts: 
 
Riff 2: 
 
e|--------------------------| 
B|--------------------------| 
G|--------------------------| 
D|-6666-7777-6666-5555-4444-| 
A|-4444-5555-4444-3333-2222-| 
E|--------------------------| 
 
Play 4 times. 
And play riff 1 2 times. 
 
Riff 3: 
e|-------------------------------------------------| 
B|-------------------------------------------------| 
G|-------------------------------------------------| 
D|-7777-9999-10101010-9999-7777-5555-2222-10101010-| 
A|-5555-7777-8-8-8-8--7777-5555-3333-0000-8-8-8-8--| 
E|-------------------------------------------------| 
 
Riff 4:                          end of song 
e|------------------------------|-----------| 
B|------------------------------|-----------| 
G|------------------------------|-----------| 
D|------10101010-9999-7777------|-5555-6666-| 
A|-6666-8-8-8-8--7777-5555-7777-|-3333-4444-| 
E|-4444--------------------5555-|-----------| 
 
Play riff 4 many times. And play end of song at the 
end of the song (easy to hear when the end comes).