I'm searching for a music full of riffs. Could you help me?

Oh, for the record, I’m not talking about the guitar.

This is pretty good. About half-way through all the players take a turn jamming a bit. It is rock music, but not hard rock.
For more piano, Transsiberian Orchestra can be good.
2Cellos for a great drum solo and, of course, crazy cello.

Just curious: can you explain what you mean by “riffs” with respect to the theme from “Exodus”? Is this what you’re referring to?

It is the group Exodus, thrash metal band.

You might like this if you like piano riffs

Are you talking about this? It’s very moving. I love movie soundtrack scores so I’d start there.

Video games have amazing soundtracks these days too.

If you mean this It’s moving in a different way, gets the blood pumping. I love that too. A lot. Nothing better than power chords through a cranked Marshall plexi/JCM

Classical and heavy metal

@Jeruba: That’s right. That song is full of those.