You would imagine that it would take a lot to impress Robin Zander and gang but wait until you see this.

Rick Diamond, Getty Images

The San Diego’s Carlsbad High School Choir was doing some rehearsing according to Society of Rock when a Cheap Trick road crew member overheard what they were doing.

The kids were working on their version of Cheap Trick's "Voices", and all of a sudden the band they were covering was in attendance.

You would think a band like Cheap Trick, it would take a lot to impress them. Millions of albums sold, members of the Rock and Roll Hall of Fame, one of the most influential rock bands of all time, etc. But wait until you see the facial expressions of the band members.