Scarlett Johansson wanted the music turned down Thursday at Chelsea Piers, where she celebrated the opening of her Broadway show “Cat on a Hot Tin Roof.” Sources tell us a speaker was blaring in her ear at the VIP table and she asked event staff to lower the volume. DJ Martial obliged. Johansson partied with Nick Jonas, Mamie and Grace Gummer and others before heading out with boyfriend Romain Dauriac, her twin brother, Hunter, and CAA’s Bryan Lourd.