Pharrell's "Happy" and Smith's "Stay With Me" were among the performances that featured gospel choirs.

From AC/DC to Beck, Annie Lennox to Adam Levine, the 2015 Grammy stage seemed like a revolving door of the biggest names in the music industry. Between the parade of musical acts, there appeared to be one recurring fixture in the night's performances: gospel choirs. 

Gospel choirs appeared in four of the night's performances, including Sam Smith and Mary J. Blige's performance of the award-winning "Stay With Me."