The group will celebrate with "lots of screaming, lots of dancing and probably lots of bottle-popping" if they reach their goal

By Melody Chiu
Updated October 22, 2015 03:55 PM
Bruce Glikas/Filmmagic

Pentatonix is so close to making music history.

The vocal group – comprised of members Avi Kaplan, Scott Hoying, Kirstin Maldonado, Kevin Olusola and Mitch Grassi – are on track to becoming the first a cappella group to hit number one on Billboard‘s music charts with their self-titled debut album (available here on iTunes).

“I think it would really put us on the map as an actual pop music act,” Grassi tells PEOPLE about what landing the top spot would mean to them. “It would be such an accomplishment for us, especially being a young a cappella group.”

Streams of their album on Amazon Music and Spotify also count as album sales. “We got very excited and then started going into overdrive brainstorming how we could get the word out about our album,” says Grassi, who’s been excitedly Tweeting fans this week.

And should they succeed in making history tomorrow, there will be “lots of screaming, lots of dancing and probably lots of bottle-popping,” according to Grassi.