The duet format pushes artists in new and sometimes perspective-changing ways while also providing us with some great covers.
This was certainly the case here.
But the episode is also book-ended by some headline-making performances the final two Playoff Passes are doled out.

Kelly Clarkson uses her Playoff Pass on ‘The Voice’.Trae Patton/NBC
Even in rehearsals, their version of Allen Stone’s “Unaware” brought Kelly to tears.
She declares ALI as the winner of the Battle.
That’s where things get interesting.

Kelly Clarkson on ‘The Voice’.NBC
That means D. Smooth is sticking around on Team Kelly.
She thinks D. Smooth can go all the way.
But that’s not the only Playoff Pass of the evening.
“You two should be in the finale,” Kelly tells both singers.
There are riffs and runs and great harmonies all over the place.