NEW ORLEANS — The screams of 65,000 fans echoed through the Caesars Superdome as Taylor Swift , in a brand-new dress, stepped up to the mic and tussled her bangs for the acoustic set on Friday.“I’ve been touring in Louisiana since I was 15 years old,” Swift said, and the audience cheered. “You guys have just been so supportive, and I come from country music.”In her orange, white and blue dress, she said, “I thought we might like to begin at the beginning.”A few chirps were heard from Swifties anticipating her secret song selection.She picked the strings to the tune of “Our Song” off her debut album, and shrieks filled every corner of the arena. Swift combined the track with “Call It What You Want” from “Reputation.” The two songs are from the two albums Swift has to rerelease.She then walked to the piano to deliver an emotional mashup of “Black Dog” from “The Tortured Poets Department” and “Haunted” from “Speak Now (Taylor’s Version).”Swift has two more nights in New Orleans before heading to Indianapolis, Toronto and Vancouver. She will sing her last Eras Tour show on Dec. 8.