Minako introduced a cappella to us. I like her speech style for some reasons. First, her voice was clear to hear her speech. Second, her speech included movie which relates a cappella so I enjoyed to hear that. Third, words she used in per speech was plain so I understood a cappella easily.

I like Pentatonix which is one of cappella groups in the world and is introduced in her speech. Pentatonix is constutedby 4 men and 1 women from America, 3 member plays main vocal part and 1 member is base vocal and last 1 member is vocal percassion. Their music is not only very beutiful but also rich in variety.   We can hear their singing on youtube.