If you're one of those who shudders at the thought of opera singers belting out Broadway songs, you may be in for a pleasant surprise with Under the Stars. Opera VIPs Renée Fleming and Bryn Terfel team up for this classy affair, which features songs from Cole Porter, Rodgers & Hammerstein, Stephen Sondheim, and others. The result is a nearly perfect example of how to pull off this kind of crossover.