(NBCNC) - When Cassadee Pope won "The Voice" last fall momentum seemed clearly on her side going into the finale.
This time around, the wrap-up promises more suspense.
"I'm think it's more up in the air this season that it's ever been," says "Voice" coach Adam Levine.
Levine and Shakira's singers are all gone, but the three who remain have all taken turns as front runners.
"It comes down to, literally, a performance," Levine says. "Michelle can win, the Swons can win. Danielle can win."
16-year-old Danielle Bradbery is the show's youngest ever finalist.
"She is an astonishing, technically proficient singer," Levine says. "There's no one left on the show that can sing as well as she can
But the Swon Brothers come in riding high.
Last week they were the show's top performers on the iTunes chart.
"It's how much people get to know you, fall in love with your personality, who you are and what you're saying musically," notes Levine.
And what Michelle Chamuel's said musically has hooked a devoted following.
"When they cheer for Michelle Chamuel, it's a different type of cheering, it's a manic kind of thing," Levine says.
That could help provide the atmosphere for a rousing finale.
The focus is on the finalists and their performances tonight.
Tomorrow night lots of guest stars are lined up for the show, leading up to the announcement of the winner.
Cher, Christina Aguilera, Bruno Mars, Pitbull, Florida Georgia Line and Nelly are all slated to appear.