Tonight on “Empire” the country will be introduced to Lauren Michelle. And while Los Angeles native Michelle is unknown to most Americans, she is already a celebrity on the world stage. Last year in the BBC Cardiff World Singer competition (think ‘American Idol’ with 350 contestants from around the world) she rose to the top and placed third. She’s currently revered as one of the world’s most well known sopranos. To put things into perspective, Lauren Michelle has been called the “black Maria Callas” and the Misty Copeland of Opera. Just as Copeland made history as the first African American female principal dancer with the prestigious American Ballet Theatre, Michelle…