Taylor Swift and Zac Efron both co-starred in the Dr. Seuss movie “The Lorax”. The only time they did a song together was on The Ellen Show, titled “All Because Of Ellen”. This song was a freestyle duet performed in 2012 by Taylor Swift and Zac Efron.
Prior to the performance, Taylor Swift had recently taught Zac Efron how to play guitar. For the audience and entertainment purposes, Zac Efron demonstrates his singing and guitar playing skills with the assistance of Taylor Swift.
Throughout the song are references to things that occurred earlier in the interview and throughout their time on the Ellen show (especially dating accusations).