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Scott Sommerdorf | The Salt Lake Tribune Vocalist Nathan Pacheco with the Mormon Tabernacle Choir, at the LDS Conference Center This April 10, 2012 photo provided by Sesame Workshop shows new Muppet Dr. Ruster, center, with, from left, Grover, Rosita, Elmo, Leah Hogsten | The Salt Lake Tribune Santino Fontana sings with the Mormon Tabernacle Choir and Orchestra at Temple Square duri