What group features half soprano singer Virpi Moskari?
Virpi Moskari: Virpi Moskari is a Mezzo-soprano, and a founder member of the Finnish a cappella group, Rajaton. Mezzo-soprano: A mezzo-soprano or mezzo ( , ; ] meaning "half soprano") is a type of classical female singing voice whose vocal range lies between the soprano and the contralto voice types.
Rajaton