According to the search results, the vault tracks are songs that Taylor Swift wrote for specific albums but didnt get recorded and put on the album. These songs were metaphorically locked away in her musical vault, and now they are released as a "surprise" to fans for each "Taylors Version" re-recording. The vault tracks are written from the time in her life that she produced each album. Taylor Swift has released more than 20 vault tracks so far. The 1989 (Taylors Version) album features five unheard vault tracks, including "Slut!" and "Is It Over Now?" as well as "Now That We Dont Talk," "Say Dont Go," and "Suburban Legends". The vault tracks offer a new window into who Swift was at the time she was working on them.