Katy Perry kicked off her Witness tour in Montreal earlier this week, and one part of her performance has left some Twitter users unhappy. Why? Well it seems that Katy decided to cover Janet Jackson's 1986 hit “What Have You Done For Me Lately” at one point — and also included a rendition of Janet’s iconic choreography at the 1987 Grammy Awards, per The Fader.

Because while some came out to defend Katy's ability to perform a cover (which is something a lot of artists do), a lot of Janet stans were less than pleased with the choice of song. Janet, after all, is a musical icon. That said, it definitely could have just been a homage to an influential hero on Katy's part.

Either way, it's launched some debate online:

Katy has yet to comment.

Related: Katy Perry, "Witness," and the Question of Celebrity Activism