Shawn Mendes slowed things down with a cover of Frank Ocean's 'Thinkin' Bout You' on a piano. This image appears in the gallery:Summertime Ball 2018 Live: The Best Photos From On Stage At Wembley 3. Shawn Mendes slowed things down with a cover of Frank Ocean's 'Thinkin' Bout You' on a piano. Picture: Giles Smith 91 images See the full gallery: Summertime Ball 2018 Live: The Best Photos From On Stage At Wembley