Answer:
In the "Battle on the Ice" from Alexander Nevsky, music by Sergei Prokofiev, the first time you hear voices, they come from the chorus in the second scene or intertitle at Lake Pleshcheyevo in cue number 2, it´s a song about Alexander Nevsky with the chorus and orchestra.
Explanation:
The second time you hear the chorus is in intertitle 6,in Pskov, the , the theme is "Peregrinus expectavi" with chorus and orchestra.
Then in intertitle 7, Pereyaslavl, "Arise,Russian People!", chorus and orchestra.
In Intertitle 10, Mobilization, "Arise, Russian People!”, chorus and orchestra.
Intertitle 11, Lake Chudskoye, The Crusaders' Camp ("Peregrinus expectavi"), chorus and orchestra.
Intertitle 15, Charge of the Crusaders, chorus and orchestra
Intertitle 16, Cavalry Attack, "Peregrinus expectavi", chorus and orchestra.
Intertitle 20, "Answer”, Bright Falcons!" The Field of the Dead, soloist and orchestra
Intertitle 25 "In Our Native Rus'", chorus and orchestra
The performance duration is approximately 40 minutes and although there are many changes in the cantata, the order of events and music changes hardly at all, and the best music is not only preserved, but improved by larger instrumental forces, richer orchestration, added choral accompaniments, greater dynamic contrasts, and, obviously, greater continuity.