If you were watching the Grammy Awards closely last night, you might have noticed a common theme pop up a few times during the show: the presence of horns.

Perhaps the most noteworthy star to don light-up, red devil horns was pop singer Katy Perry, though she was hardly the only performer or audience member to wear them.

LOS ANGELES, CA - FEBRUARY 08: Attendees wear plastic devil horns during AC/DC's performance at The 57th Annual GRAMMY Awards at the at the STAPLES Center on February 8, 2015 in Los Angeles, California. Credit Kevork Djansezian/Getty Images

Attendees wear plastic devil horns during AC/DC’s performance at The 57th Annual GRAMMY Awards at the at the STAPLES Center on February 8, 2015 in Los Angeles, California. (Kevork Djansezian/Getty Images)

While some viewers expressed confusion as to why the devil horns were making an appearance, Business Insider reported that they were handed out to accompany AC/DC’s opening performance of “Highway to Hell,” noting that the band’s name was actually printed on them.

The horns weren’t present throughout the entire night, though, as a message reportedly popped up on the Grammy teleprompter asking audience members — Perry included — to put them away for the remainder of the show.

LOS ANGELES, CA - FEBRUARY 08: Attendees wear plastic devil horns during AC/DC's performance at The 57th Annual GRAMMY Awards at the at the STAPLES Center on February 8, 2015 in Los Angeles, California. Credit Kevork Djansezian/Getty Images

Attendees wear plastic devil horns during AC/DC’s performance at The 57th Annual GRAMMY Awards at the at the STAPLES Center on February 8, 2015 in Los Angeles, California. (Kevork Djansezian/Getty Images)

“Ladies and gentlemen: the devil horns are yours to keep, but please put them away for the rest of the show. Thank you,” the message read, according to tweets sent by Matthew Belloni, executive editor at Hollywood Reporter, and an Instagram photo from People Magazine.

OS ANGELES, CA - FEBRUARY 08: Katy Perry and Ferras attend The 57th Annual GRAMMY Awards at STAPLES Center on February 8, 2015 in Los Angeles, California. Credit Kevin Mazur/WireImag

Katy Perry and Ferras attend The 57th Annual GRAMMY Awards at STAPLES Center on February 8, 2015 in Los Angeles, California. (Credit Kevin Mazur/WireImag)

But that wasn’t the only purported reference to the devil, as MTV quipped that “Madonna got kind of satanic with a bunch of masked, horned bull-men” during her performance for the song “Living For Love.”

While its unclear exactly what Madonna was aiming for on the religious symbolism front, the performance did feature images of crosses.

Watch it below:

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