Nelson Mandela's Musical Tributes: R. Kelly, Nicole Scherzinger, 'Lion King' Cast (Video)

Watch the R&B singer perform "Soldier's Heart," the "X Factor" judge sing hymnal praise and Broadway's "The Lion King" cast join for "One by One." As the world continues to mourn the passing of Nelson Mandela -- who died on Thursday at age 95 -- a handful of musicians have chosen to pay tribute though music. PHOTOS: Nelson Mandela With His Hollywood Friends R. Kelly composed a special song for the late civil rights icon and said he had performed it in Mandela's living room. He sat down at a gran...