YNS meaning in Community ?

"You're Not Sorry" is a song by American singer-songwriter Taylor Swift. The song was solely written by Swift and produced by Swift and Nathan Chapman. It was released on October 28, 2008, by Big Machine Records as a promotional single from Swift's second studio album, Fearless on iTunes, though it is no longer available. A remix version for the television episode of CSI: Crime Scene Investigation in which Swift made an appearance was later released. Swift wrote "You're Not Sorry", inspired by an ex-boyfriend who was revealed to be opposite of what he appeared to be. The song is a country pop power ballad.

Contemporary critics gave "You're Not Sorry" average to favorable reviews. In North America, the song achieved commercial success. It peaked at number 11 on Canadian Hot 100. In the United States, "You're Not Sorry" also peaked at number 11 on the Billboard Hot 100 and was certified platinum by the RIAA. Swift performed the song in several venues, including on her first headlining tour, the 2009 and 2010 Fearless Tour. During the tour, Swift performed a mashup of a cover version of Justin Timberlake's "What Goes Around.../...Comes Around" and "You're Not Sorry".