CONCERTS "In the light genre" . The symphony orchestra and soloists of the St. Petersburg Conservatory , as well as conductor Alexander Sladkovsky, perform fragments from operettas, waltzes, polkas, music from films by composers Strauss, Suppe, Lehár, Kalman, Offenbach, Khrennikov, Petrov. Tchaikovsky Concert Hall , 19.00. Easter organ music . Dmitry Bondarenko (organ) will perform music by Bach, Haydn, Messiaen, Bruns. Roman Catholic Cathedral , 20.00. "Pioneers of the Russian avant-garde" .