America is introduced to the 8 best a cappella groups in the nation. These elite 8 must each take the stage and win us over with their amazing harmonies -- they're all competiting for a record contract with Sony and a cash prize. Each group will go head-to-head performing their choice song. At the end of the first hour, the group with the lowest score, as determined by the judges, will be in the bottom two. In the second hour, the next four groups will perform and the group with the lowest score, will compete in a sing-off with the other group in the bottom 2. The judges will evaluate and one group will be sent home.