Two rival A Cappella teams bring in professional coaches to give them an edge for the Summer A Cappella season. These coaches only have 8 weeks to get these teams into shape before the finals of the Summer Invitational.

The teams take on two new competitors for the second week of the Summer A Cappella Season.

It's the 3rd week of the Summer A Cappella Season and Stay Tuned is off to a rough start when they learn that half their team won't be able to make it to this week's competition. Meanwhile, Coach Diana takes a huge risk by giving the lead solo to an unexpected member of Highlands Voices, causing the rest of the team to struggle when they realize they have to learn new skills in order to make the song work.

It's the 4th week of the Summer A Cappella Season and things start off with a bang. The members of Highlands Voices decide to push back at on Diana's methods, which could collapse the whole team. Meanwhile, Stay Tuned's natural talent is threatened by a natural disaster!

This week brings the first elimination round of the Summer Invitational leading to higher stakes than ever. Highlands Voices continues to disagree with some of Diana's choices while Stay Tuned is lacking the confidence they need to nail their next performance.

In the second week of elimination, Diana and the Highland Voices will do whatever it takes to remain in the competition. Meanwhile, Deke and Stay Tuned go for a risky song that represents an iconic high school experience.

Deke tries a new tactic and decides to play it safe in the semi-finals of the Summer Invitational. Meanwhile, Diana is hoping to take her group to the next level with some professional help. With an elimination on the line, which coach will have the winning strategy?

With the Summer Invitational Championship finally within reach, Diana and the Highland Voices are throwing everything they have into the final competition to attempt to take home the trophy. Deke's perennial underdogs, Stay Tuned, play up their ability to tap into their emotions in their final effort to win the title. Which voices will rise to the top in perfect harmony?