Michael W. Smith The Spirit Of Christmas

I was just curiouse and checked who are the singers of each song. Here what I found:
"Christmas Time is Here"- features Vince Gill
" White Christmas" features Lady Antebellum
"Somewhere In my Memory" features Audrey Smith and the Nashville Children's Choir
"The Spirit of Christmas" (medley: Deck the Halls/Good King Wenceslas/O Little Town of Bethlehem/Feels Like Christmas/O Come All Ye Faithful)
"Silent Night" (features Little Big Town)
"What Child Is This?" (features Martina McBride)
"Almost There" (features Amy Grant)
"All Is Well" (features Carrie Underwood)
"Christmas Day" (features Jennifer Nettles & the Nashville Children's Choir)
"The Darkest Midnight" (with spoken word by Bono)
"Peace" (features Michael McDonald)