WATCH: 21 Songs Mashed Up with David Guetta’s 2U is Pretty Incredible

YouTube star and singer Connor Maynard is no stranger to ridiculously elaborate mash-ups, and this time he brings in fellow Brit singer songwriter Olly Murs to help him out.

In what he calls a sing-off, the two artists take on a whopping 21 songs, sang over the beats of David Guetta and Justin Bieber’s new song collaboration, 2U. 2U is a fresh track, just released this June, so seeing Connor Maynard and Olly Murs already out with this sick remix is not only quick-thinking but kind of impressive, too.

From Ed Sheeran, Hozier, Jay-Z, R. Kelly, and Taylor Swift just to name a few (remember, there are 21 tracks!), this genius mash-up will really make you wonder: how the hell did they do that???

Watch below:

Love this mash-up or not? Share your thoughts in the comments!