reporter: there was the orchestra that performed the concert for peace in a public square in the middle of the day, despite the danger of an air strike. and the cellest who defied the invaders in front of bombed-out buildings. and who can forget the little girl with the sweetest voice who made those around her forget they were in a bombsh shelter? one by one, singers and musicians in ukraine have defied the russians by using their talent to unite a nation and soothe a terrified population. we love singing. reporter: the most famous one is vietoslav barotchuk, known as s s slava, known as the ukrainian bruce springsteen. he could have chosen to flee the country. instead, he decided not only to stay but to visit terrified civilians like these people seeking shelter in a kharkiv