Shawn Mendes's voice is no joke, folks. The 20-year-old singer showed off his vocal chops during The Tonight Show Starring Jimmy Fallon when he sat down with the host and The Roots to sing his 2016 hit "Treat You Better" in the show's music room. The only catch? The band grabbed classroom instruments for this stripped-down rendition — we see that xylophone! While Mendes took the opportunity to display his natural talent, he couldn't help but give Fallon a chance to belt out some key lines too. Watch the above video to see their full performance. We promise you won't be "wasting time" with this one.