It's game day at Comerica Park in Detroit, home of the Tigers.

It's June, and there's rows upon rows of empty green plastic seats,

just beginning to be warmed by the summer sun.

The pitcher's mound is covered.

The perfect green of the outfield is undisturbed.

This is what the ballpark is like, hours before the crowd gets here.

The setup is like any other baseball game during the break of the season.

In a few hours, those familiar players will run out to a familiar field.

Hot dogs will be eating, beer will be poured, but one thing will be different.

The opening song.

At the edge of the field, there are two singers doing the sound check.

Tonight, and for one night only, these singers will perform, lift every voice and sing.

Every voice of the speak,

many people call it the Black National Anthem.

Tonight's performance of it is part of what the Tigers call Negro League's weekend.

One weekend in the heart of summer to honor those who weren't allowed to play in the major leagues.

Those who could only play in separate leagues, all because of the color of their skin.

These singers are the daughters of one of the best Negro League players of all time. Turkey Stearns.

Turkey loved the Tigers.

Went to every game he could, but he could never set foot on their field as a player.

Now, every year, the Tigers raise the flag of his Negro League team high above the stadium,

and his daughters sing for the crowd.

...