Encore Appetizers There are four small encores to nibble on at the start of this edition of Performance Today. Pianist Olga Kern lets her fingers do the buzzing in Rimsky-Korsakov's ever-popular "Flight of the Bumblebee," in concert at Spivey Hall, just outside Atlanta. Then it's a pair of Chopin Piano Preludes (in E Minor, Op. 28, No. 4; in A, Op. 28, No. 7) all spruced up for orchestra and performed in concert in Krakow, by the Amadeus Polish Chamber Orchestra. Ever heard of an 11-second encore? Well, pianist Garrick Ohlsson pulled a Beethoven Bagatelle (Bagatelle in A Major, Op. 119) out of his sleeve and closed a recital with it in Prague. And finally, cellist Steven Isserlis introduces a remarkable piece for solo cello, called "Chonguri," by Georgian composer Sulkhan Tsintsadze. Isserlis was in concert in Hanover, Germany.