Chance the Rapper Stars in Twitter Commercial

The Chicago rapper was chosen because of his “authentic” use of the platform to communicate with his fanbase and conversations that surround him.

Grammy-winning artist Chance the Rapper leads the celebrities starring in Twitter’s new campaign, which debuted on Monday at the annual Cannes Lions ad festival in France.

Toward the end of the ad, 75-year-old Crosby also tells Chance, “I could up your game”, causing both the rapper and rocker to smile before Chance rides a bike onstage to perform.

All of a sudden, David Crosby appears and asks him, “How about any song with real instruments?”

Get Data Sheet, Fortune’s technology newsletter. Twitter explained the campaign in a blog post.

The ad’s goal is to display how Twitter lets you “see what’s happening from every point of view, all perspectives, every side”, per the app’s research.

Crosby’s appearance in the clip was a cheeky nod to a message he wrote on Twitter in 2015, stating, “Rap isn’t music”. So when one of those companies runs a TV ad, it’s notable – in an ironic sort of way.