Glee Cast Sings National Anthem

Following last night's thrilling 7-4 victory, the New York Yankees are poised to win their 27th World Championship.

As a result, one might refer to their fans as "gleeful."

But the entire country was full of Glee Saturday night... literally! That's because the cast of this Fox hit sung the National Anthem prior to Game Three of the World Series.

Watch and listen below, as Mercedes Jones (Amber) takes the lead: