Ariana Grande and Justin Bieber have teamed up for a charity single to benefit the children of first responders amid the coronavirus pandemic.The 26-year-old singers, who share manager Scooter Braun, announced this Friday that their song Stuck With U will be released on May 8.Justin hinted there might be audience participation in the song, writing on Instagram: 'Check back later today for the instrumental so you can be a part of this.' 'Check back later today':Ariana Grande and Justin Bieber have teamed up for a charity single to benefit the children of first responders amid the coronavirus pandemic Singing up a storm:The pair hit the stage together at the Coachella Music Festival last April and performed his hit single SorryBoth Ariana and.