Led Zeppelin - Lemon Song (main Riff) bass tab

g---------------------

d---------------------

a-----------------7--7

e--0-0-4-4-5-5-7-0----

after a few of those it goes

g--------------------

d-----------------7-7

a--0-0-4-4-5-5-7-0---

e--------------------

and thats one i worked out listning to the song