The Camellia Symphony Orchestra opens its 47th season with "Prodigies from St. Petersburg" at the Memorial Auditorium on Saturday.  The concert will feature the music of three composers from that city: Nikolai Rimsky-Korsakov, Dmitri Shostakovich and Sergei Prokofiev. “Everything ends on a high note in all three of the pieces and the sounds that the audience members are going to hear are just breathtaking,” said Allan Pollack, music director and conductor. “I think it was a great way to start off the season.” The performance also will feature local cellist Burke Schuchmann, who will perform during Shostakovich's “Cello Concerto No. 1.” Schuchmann said he was excited to work with such a