season 21 live shows are here and it's time for fans to vote!Following the Top 20 performances on Monday night, Tuesday's live show features the announcement of the Top 13 — including the winner of last week's Comeback Singer vote, who will compete against one remaining competitor from each team for the first Instant Save of the season.During Tuesday's show, when host Carson Daly makes the announcement that Instant Save voting is open, fans can vote for their favorite artist by