STS9 fans attending the quintet’s show Saturday evening were given a special Valentine’s Day treat in the form of a cover ofhit, “Crazy In Love.” The funky instrumental cover debuted sandwiched in the middle of the band’s original, “Monkey Music,” during the first set of their February 14 show –the second night of their three-night stand at the Belly Up in Aspen, Colorado.

Watch the nearly 15 minute video below posted by YouTube user stealthvids9, the Bey tune kicks in at around the 10:30 mark, and enjoy the crowd’s frenzied reaction:

STS9 next takes the stage with a three-night stand at Chicago’s House of Blues March 5 -7.