Which choir collaborated on a mix tape that was produced among others by the group The Social Experiment and that featured the song "Angels"?
Angels (Chance the Rapper song):  The song was released on October 27, 2015 as the lead single from his third solo mixtape, "Coloring Book" (2016). Angels (Chance the Rapper song):  The track, produced by Lido and The Social Experiment, features vocal by fellow Chicago rapper Saba. Coloring Book (mixtape):  For the album, Chance also collaborated with musicians such as Kanye West, Young Thug, Francis and the Lights, Justin Bieber, Kirk Franklin, and the Chicago Children's Choir.
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