Castles Crumbling

"Castles Crumbling" is a song written and recorded by the American singer-songwriter Taylor Swift, featuring the American singer-songwriter Hayley Williams. Swift wrote the track and intended to include it in her third studio album, Speak Now (2010), but left it out of the track-list. She produced the track with Jack Antonoff for the re-recording of Speak Now, the 2023 album Speak Now (Taylor's Version). "Castles Crumbling" is a piano-driven emo and indie folk ballad, and its lyrics are about the pressure of fame.

Music critics interpreted that "Castles Crumbling" was influenced by the incident involving Swift and the rapper Kanye West at the 2009 MTV Video Music Awards. They gave the song generally positive reviews and described its nature as delicate. The song peaked in the top 40 on the Billboard Global 200 and on the charts in Australia, New Zealand, and the United States. Swift performed it live twice on the Eras Tour, once in 2023, and the other time in 2024.