The Who - Baba O Riley Bass

G---------
D--3------
A-----3--1
E---------

That is the standered riff, but here's one that I came up with this you can play right before the chrous:

G-------5----3-1-3-5-3-------
D--3----------------------5--3--
A-----3---1---------------------5
E--------------------------------

That riff deals with octaves, and you should play it alittle fast.

This is the last part of the song:

G-------
D-3-----
A---3---
E-------

keep going faster and faster until the song ends.