Mickey Guyton

Brandi Carlile and Maren Morris are also in the lineup.

"The hardest and most beautiful thing I have ever done," she writes.

Plus, see which other stars are speaking up.

While remembering those African-Americans who paved the way, there are still so many people who have made history in the past century.

Jana Kramer's husband Michael Caussin was insensitive, ignorant or worse.