Premise: "22" is a song recorded by American singer-songwriter Taylor Swift for her fourth album, "Red" (2012). It was written by Swift along with Max Martin and Shellback. The song was released as the album's fourth single on March 12, 2013. The lyrics describe the joys of being 22 years old.
Hypothesis: Max Martin and Shellback colaborated with Taylor Swift in many songs of her fourth album "Red" (2012).