Rihanna, Bruno Mars, Sting, Ziggy and Stephen and Damian Marley perform in tribute to Bob Marley at last year's Grammy Awards. - 

It's awards season, and one of the big events will be this Sunday when the 56th annual Grammys air on CBS. Last year 28 million people watched the show on TV. But more and more, some of the action and the ads will be happening on the so-called second screen. Slate tech blogger Will Oremus tells Marketplace Tech about the online ads for the Grammys.