A

I

II

III

IV

V

VI

1-я

2-я

3

3-я

2

4-я

1

5-я

6-я

D

I

II

III

IV

V

VI

1-я

2

2-я

3

3-я

1

4-я

5-я

6-я

C

I

II

III

IV

V

VI

1-я

2-я

1

3-я

4-я

2

5-я

3

6-я

E

I

II

III

IV

V

VI

1-я

2-я

3-я

1

4-я

3

5-я

2

6-я

Musica

tune one step down

Intro:        g-9-9-7-9-9-7-9-9-7-9-9-7--6-6-6-7-7-7-----------9-9-9
d-7-7-7-7-7-7-7-7-7-7-7-7--7-7-7-7-7-7--10-10-10-9-9-9
a---------------------------------------10-10-10-7-7-7
e----------------------------------------8-≈8-≈8-------

Verse is something like this:
e-5----3-----5-----3
b-5----3-----5-----3        etc
these two └chords" go along┘

Chorus:
all of them are power chords
A D C E
A D C E
A D E E
A D E E
play it twice
And now the fun: :-)

Nirvana riff:
a----------3---3----------5---
e-3-3-4-5≈5--5-5-4-3---3-3

Deep Purple riff
d---------------------5/7-108
a---3---------3≈5-3---5/7-108
e-5≈-5-3-0-3-5≈5----5-3/5--85

I think everyone can figure out the bass riffs