Kanye West by Frank Mullen/ WireImage.com Kanye West by Frank Mullen/ WireImage.com

Though he has not even been announced as an official performer, Kanye West reportedly has been rehearsing a tribute to his late mother, Donda, for Sunday's Grammy Awards. According to People, West - the show's most-nominated contender this year - will deliver a medley that will include "Stronger" and "Hey Mama."

For more coverage of Sunday's kudoscast, check our Grammy Awards special, featuring predictions, photos, video, a reader poll and more.