"Best Day of My Life" is a song by American #popRock band #AmericanAuthors, released on March 19, 2013, by #MercuryRecords and #IslandRecords as the #leadSingle from their third #extendedPlay, American Authors (2013), and the second single from their debut studio album, #OhWhatALife (2014).

"Best Day of My Life" is a song by American #popRock band #AmericanAuthors, released on March 19, 2013, by #MercuryRecords and #IslandRecords as the #leadSingle from their third #extendedPlay, American Authors (2013), and the second single from their debut studio album, #OhWhatALife (2014).

"Best Day of My Life" is a song by American #popRock band #AmericanAuthors, released on March 19, 2013, by #MercuryRecords and #IslandRecords as the #leadSingle from their third #extendedPlay, American Authors (2013), and the second single from their debut studio album, #OhWhatALife (2014).