Question: What American actress, singer, and songwriter stars alongside Josh Gad, Kristen Bell, and Jonathan Groff in what upcoming 2017 American 3D computer-animated holiday-themed musical fantasy featurette short film?
Sentence (from "Olaf's Frozen Adventure"): Olaf's Frozen Adventure is an upcoming 2017 American 3D computer-animated holiday-themed musical fantasy featurette short film produced by Walt Disney Animation Studios and released by Walt Disney Pictures, directed by Kevin Deters and Stevie Wermers.
Relevant evidence: Yes