Russian Valery Levin is considered one of the world 's leading composers . He holds three senior positions at the famed Mariinsky Theatre in Russia . ` If you do something , if anyone in the orchestra does something that he was n't quite expecting or takes a little turn here or there , then he 'll look up and grin and that 's a good moment , '' says Rachel Gough . In 2007 , he joined the London Symphony Orchestra as principal conductor . Gergiev brings emotion to audiences , mainly through his facial expressions .
Russian Valery Levin is considered one of the world 's leading composers . He holds three senior positions at the famed Mariinsky Theatre in Russia . In 2007 , he joined the London Symphony Orchestra as principal conductor . Gergiev brings emotion to audiences , mainly through his facial expressions .