4， "Best Day of My Life," American Authors

Best Day of My Life" is a song written by Zac Barnett, Dave Rublin, Matt Sanchez and James Adam Shelley of the American indie rock band American Authors, with writers Aaron Accetta and Michael Goodman. The song was originally released as a single by Mercury Records and Island Records on March 19, 2013 and later appeared as the second track on the band's third extended play, and the third track on their debut studio album, Oh, What a Life. The song was produced by Shep Goodman and Aaron Accetta.
《Best Day of My Life》，是由美国独立摇滚乐队American Authors中的成员Zac Barnett, Dave Rublin, Matt Sanchez 和 James Adam Shelley，联合作家Aaron Accetta 和 Michael Goodman 所写的歌。这首歌最初是作为单曲，由水银唱片公司和环球唱片公司于2013年3月19日发行，之后作为第二条音轨被收录在该乐队的第三个密纹唱片中，并且作为第三轨出现在他们首张专辑《Oh, What a Life》中。这首歌是由Shep Goodman 和 Aaron Accetta 担任制作的。