The 7th symphony was premiered in 1942 ; its performance in the besieged Leningrad at the Bolshoy Philharmonic Hall under the baton of conductor Karl Eliasberg was heard over the radio and lifted the spirits of the survivors .
The 7th symphony was premiered in 1942 ; its performance in the besieged Leningrad at the Bolshoy Philharmonic Hall under the baton of conductor Karl Eliasberg . 
 It was heard over the radio and lifted the spirits of the survivors .