At 7 p.m. Saturday, Dec. 14, the benefit Mt. Blue Voices Concert featuring the MBHS a cappella vocal ensemble will be held in the school’s Forum in Farmington. The program will feature original arrangements written for the group by their director, Dennis Hayes, and songs by Katy Perry, The Black Eyed Peas, Alicia Keys, The Temptations, Pink, The Dave Clark Five in addition to holiday songs. The group’s album will be sold during the concert. All proceeds go toward a planned Disney World trip.