“Virtuoso Variations,” the closing concert of this season’s series, features Beethoven’s imaginative Variations on “God save the King;” Mendelssohn’s deeply expressive Variations Sérieuses; Rachmaninoff’s breathtakingly beautiful “18th Variation” from Rhapsody on a Theme by Paganini; and Tschaikovsky’s dazzling Variations, Opus 19, No 6, based on his own gorgeous original melody.  This is a not-to-be-missed experience for new and seasoned classical music lovers alike.