led zeppelin
how many more times

You'll have to get the timings from the song, but
it's quite a simple tune to learn

G|---------------------------------|
D|---------------------------------|
A|------7-5--5------7--5-----------|
E|-0--------7-----0-------7--------|

repeat ad infinitum, ocassionally there is a break

which goes

G|---------------------------------|
D|---------------------------------|
A|---5-5-5-------------------------|
E|----------5-5-5------------------|

And that's it. Simple huh.