When Emma Falls In Love

Originally intended for but left out of the track listing of her 2010 studio album Speak Now, the song was included in Speak Now (Taylor's Version), the 2023 re-recording of the album. Produced by Swift and Aaron Dessner, the song is about the narrator's experience of watching a friend fall in and out of love and her admiration for that friend.

Incorporating crossover elements between country and pop, it begins as a gentle ballad before building up to its chorus. Some critics deemed "When Emma Falls in Love" a highlight of Speak Now (Taylor's Version). The song peaked at number 36 on the Billboard Global 200 and entered charts in Australia, Canada, New Zealand, and the United States.

After signing a new contract with Republic Records, the singer-songwriter Taylor Swift began re-recording her first six studio albums in November 2020. The decision followed a public 2019 dispute between Swift and the talent manager Scooter Braun, who acquired Big Machine Records, including the masters of Swift's albums which the label had released. By re-recording the albums, Swift had full ownership of the new masters, which enabled her to control the licensing of her songs for commercial use and therefore substituted the Big Machine–owned masters. In 2021, Swift released two re-recorded albums of her earlier releases: Fearless (Taylor's Version) and Red (Taylor's Version); each album also featured several unreleased "From the Vault" tracks that she had written but left out of the original albums' track listings.

On May 5, 2023, at the first Nashville date of her sixth concert tour, the Eras Tour, Swift announced Speak Now (Taylor's Version) as her third re-recorded album; it is the re-recording of her third studio album, Speak Now (2010). She shared on social media that the original album was "a tale of growing up, flailing, flying and crashing [...] and living to speak about it" that covered "brutal honesty, unfiltered diaristic confessions and wild wistfulness". On June 5, 2023, Swift announced the track-list of Speak Now (Taylor's Version), which consists six "From the Vault" songs were intended for but left out of Speak Now's 2010 track listing. One of them is "When Emma Falls in Love".

"When Emma Falls in Love" is four minutes and twelve seconds long. Swift wrote the track and produced it with Aaron Dessner, who plays instruments including acoustic, bass, electric guitars, piano, and synthesizer. Other musicians on the song includes Benjamin Lanz (synthesizer), James Krivchenia (drums, percussion), James McAlister (synthesizer, drums, percussion), and Josh Kaufman (electric guitar, banjo, organ). Christopher Rowe and Mike Meadows provides background vocals, and Rowe engineered the vocals. Dessner and Jonathan Low engineered the track, with assistance from Lans, McAlister, Bella Blasko, and Thomas Bartlett. Low mixed the song and Randy Merrill mastered it.

"When Emma Falls in Love" begins as a gentle ballad alongside a "lilting piano that lends the song a childlike spirit". It builds up to an "explosive chorus". The song has a "classic Nashville pop-country backing" and crossover elements between country and pop, including the use of the banjo and a piano melody. The lyrics details the narrator's experience of watching a friend fall in and out of love. The happy ending of the song, in which the friend and a boy begin a relationship, has been compared to that of "Love Story" (2008). In the last verse, the narrator sings how she has learned from her friend's experiences with love and laments "To tell you the truth, sometimes I wish I was her". Journalists observed that "When Emma Falls in Love" underscores the narrator's admiration for her friend. Elle Australia described it as "a friendship song showing all her friend's best qualities".

Speak Now (Taylor's Version) was released on July 7, 2023, by Republic Records; "When Emma Falls in Love" sits at number 18 on the track-list. On the same day, Swift performed the track as a "surprise song" at Arrowhead Stadium in Kansas City, as part of the Eras Tour. Commercially, the song debuted on the US Hot Country Songs and the overall Billboard Hot 100, with peaks of number 15 and number 34 respectively. Elsewhere, it reached the countries of New Zealand (37), Canada (40), and Australia (43), and peaked at number 36 on the Billboard Global 200.

USA Today picked "When Emma Falls in Love" as the best "From the Vault" track from the album. Will Hodgkinson of The Times gave the song four out of five stars, describing it as "catchy and uplifting". Jonathan Keefe from Slant Magazine called the song "spectacular" and said it brings "some much-needed outside perspectives" to the album. Kate Solomon of i considered it "extremely mediocre".

Credits are adapted from the album's liner notes