I need two riffs

[CarneVaca]

OK, who has the main riffs for "Can't Go Back" and "I Know I'm Not Wrong?"

The Can't Go Back riff I don't think is a guitar. It goes something like this:

Tum-ta tum-ta-ta
Tum-ta tum-ta-ta

The "I Know I'm Not Wrong" one is a guitar riff. And it goes:

Tum-tu tum-tu tum-tu
Tum-tu-tu-ta-ta-te-tu

Thanks.