VIDEO : Taylor Swift Delivers Chilling Acoustic 'Out of the Woods' Performance

Taylor Swift celebrated the one-year anniversary of her blockbuster pop album, 1989, with an acoustic performance of "Out of the Woods," recorded last month at the Grammy Museum's Clive Davis Theater. Swift introduced the song by saying it chronicled a relationship dominated by anxiety: "I think a lot of relationships can be solid, and that's what you hope for ? solid and healthy ? but that's not always what you get," she said.