Valerie Rockey and Zack Everhart, Jr. dance Tap on So You Think You Can Dance 11 (VIDEO)

Valerie Rockey and Zack Everhart, Jr. danced Tap on So You Think You Can Dance 11 Top 20 on Wednesday, July 2, 2014.

Anthony Morigerato was the choreographer.

Music was "Sing" by Ed Sheeran.

Anthony utilized the classic tap prop, the staircase.

"Wow wow wow," said head judge Nigel Lythgoe. "Like good drummers you got different sounds... You were both magnificent."

"I was just tapping in my seat holy smokes," said Mary Murphy. "Valerie, you were just a star out there."

"I'm a tapper as well," said guest judge Jason Derulo. "That was unbelievable. My hat goes off to you guys."

To vote for Valerie Rockey or Zack Everhart, Jr. go to fox.com/dance.

Watch the full performance video here: