The Tallis Scholars perform "Ikon of Light" by composer John Tavener.
Pianists Martha Argerich and Daniel Barenboim perform a two-piano arrangement of Stravinsky's "Rite of Spring."
The Matryomin Ensemble performs a theremin choir version of Beethoven's "Ode to Joy."
Canto Deo performs "Hark! The Herald Angels Sing."
The Dover Quartet performs Mozart's String Quartet No. 20 in G major, third movement, in the CPR Performance Studio. Recorded Dec. 3, 2014.