The gala featuring classical and popular works by Tchaikovsky, Chopin, Rachmaninoff, Ysaÿe and others will be performed by an outstanding lineup of musicians and singers, nearly all from the former Soviet Union. Appearing will be husband-and-wife duo Mark Mogilevski (violin) and Elena Mogilevski (piano); Alex Pokryshevsky (singer) and sons Max(xylophonist) and Anton (pianist/composer); pianists Boris…