During an appearance on \"The Tonight Show Starring Jimmy Fallon,\" Swift shared the true story of how the extended version of \"All Too Well\" came to be. Swift, who said she was about 21 at the time, told Fallon that she was \"going through a bit of a sad time\" while rehearsing for her upcoming \"Speak Now\" tour.

\"I just was really upset and sad, and everybody could tell,\" she said. \"It was really not fun to be around me that day.\"

So she picked up her guitar and began playing \"the same four chords over and over again,\" Swift said. The song flowed from her organically as she \"started ad libbing what I was going through and what I was feeling,\" she explained. As she was venting through her music, the band joined in \"and the song kept building and building and building in intensity,\" she said.

\"The song just went on for 10 to 15 minutes,\" she told Fallon, crediting her mother for checking at the end of rehearsal if \"my sound guy\" managed to capture the profound moment on tape.

\"He was like, 'Yep!' and handed her a CD,\" she said with a grin. \"The 10-minute version of 'All too Well' is what was originally written for the song before I had to cut it down to a normal-length song.\"

Swift revealed that releasing the original version of \"All Too Well\" is \"the thing I'm the most excited about.\"

She also discussed how she mastered the art of hiding \"Easter eggs\" and encouraged fans to keep their eyes peeled when watching the short film version of \"All Too Well,\" starring actors Sadie Sink, of the Netflix series \"Stranger Things,\" and Dylan O'Brien, of the film trilogy \"Maze Runner.\" Swift announced that she will be premiering the short film at the AMC 13 Theater in New York City's Lincoln Square on Friday afternoon.

Swift's late night tour will continue Saturday, when she will appear as a musical guest on \"Saturday Night Live.\" She hinted that she might perform the 10-minute version of \"All Too Well\" in its entirety.

Here's the full track list for \"Red (Taylor's Version)\":

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