America's Got Talent revealed its first four sixth-season semifinalist acts during Wednesday night's live broadcast of the NBC reality competition series.

Anna Graceman, a singer and pianist from Juneau, AK; Sandou Trio Russian Bar, a Russian bar trio from San Antonio, TX; and Snap Boogie, a dancer from Boston, MA, were revealed to have finished as the Top 3 vote-getters after Tuesday night's performance show which featured the season's first group of 12 quarterfinalists performing for home viewer votes, automatically earning them a spot in America's Got Talent sixth-season semifinals.

America's Got Talent host Nick Cannon also revealed that singer and pianist Dezmond Meeks, trapeze duo Duo Aero, animal act Echo of Animal Gardens, family daredevil act Fearless Flores Family, comic and musician J. Chris Newberg, musical band Squonk Opera, and variety act Those Funny Little People had received the seven lowest home viewer vote totals.

The announcements then left America's Got Talent judges Piers Morgan, Sharon Osbourne and Howie Mandel with the task of deciding which of the two acts that had received the fourth and fifth highest vote totals -- Miami All Stars, a dance group from Miami, FL, or The Fiddleheads, a bluegrass band from Dahlonega, GA -- should become the fourth act to advance to the semifinals.

"Two very, very different acts... Miami All Stars, 42 very spectacular dancers.  Your synchronicity is brilliant, you bring such energy to this show. Fiddleheads -- initially, I loved your uniqueness, you're very pure as a group... I love the combination with the bluegrass.  But I have to be honest, last night, I was very disappointed with the song choice, it didn't work for me, it just didn't work," Sharon said.

"So I have to be true to myself and I have to say that for me, it's all about the Miami All Stars."

Piers then also quickly cast his vote for the Miami All Stars, rendering Howie's vote moot.

"Two good acts... but for me, you have to give it to the act that performed best on the night and it's going to be Miami All Stars," he said.

America's Got Talent's next episode will air Tuesday, July 21 and feature the season's next group of 12 quarterfinalists performing for the chance to advance to the semifinals.