The amazing Las Vegas Sphere opened in the summer of last year, and the very first act was the world renown rock band U2. They blew the roof (can we call it a roof?) off the Sphere every month since, but their time at the venue is coming to an end in early March. And the question is who will follow them? Well, there have been lots of rumors floating around, but several days ago the folks at the Las Vegas Sphere finally made an official announcement. And while the next band may be more mellow and not as famous,…