Shawn Mendes made a powerful statement in solidarity with gun violence victims at the 2018 Billboard Music Awards on Sunday (May 20). The singer-songwriter performed his new single “Youth” with another rapidly rising star, Khalid — as well as members of the Marjory Stoneman Douglas High School choir from Parkland, Fla. Dressed in a t-shirt that read “Protect our guns” with a slash through the word “guns” and the word “children” replaced, Khalid harmonized with Mendes, who strummed an acoustic guitar as they delivered the song’s affecting lyrics. The song thematically champions keeping one’s spirit although times are difficult and...