Fans were quick to react on Twitter.
Taylor Swift is heading back to her country roots... on an Earth, Wind & Fire song.
The legendary group presented the 28-year-old singer with a GRAMMY award in 2016, and she repaid them by covering their famous track, "September."
Swift -- who released the song as a Spotify exclusive on Friday alongside an acoustic version of her song "Delicate" (both were recorded at The Tracking Room in Nashville, Tenneessee) -- removed the funk and soul of the 1978 hit in favor of a more romantic, instrumental version. Fans quickly took to Twitter to share their thoughts.
Listen for yourself below.
"I just listened to the new taylor swift cover of september by earth wind and fire," one user wrote alongside a gif reading, "The line must be drawn HERE! No further!"
Another simply wrote, "#BlackTwitter I need you to make sure that Taylor Swift's cover of September never sees the light of day," as others expressed their disapproval.
Other users, meanwhile, defended Swift's song. "People who are mad at Taylor Swift for changing the genre of September are the same people who think I Will Always Love You is an original Whitney Houston song," one user tweeted.
"September" isn't the only new music Swift has been working on. The singer is also set to appear on Sugarland's upcoming album, Bigger, as she's featured as a vocalist on "Babe," a song she wrote years earlier with Pat Monahan of Train.
See more on Swift in the video below.