The luminous Serenade for Strings (Op.48) by Tchaikovsky pairs beautifully with the choreography of one of his biggest fan, George Balanchine.
Near the end of the first movement, as the sweeping orchestral line descends, the corps marches in orderly formation offstage, leaving the solo ballerina alone—poised in stillness—until her partner moving in counterpoint towards her. This moment (exactly 10:00 below) always gives me goosebumps: