What is today is gonna be the day?

"Today is gonna be the day" is the opening line of the hit song "Wonderwall" by British rock band Oasis. The song was released in 1995 as a single from their second album (What's the Story) Morning Glory?. It was written by lead guitarist Noel Gallagher and became one of their signature songs, achieving critical and commercial success worldwide. The phrase "today is gonna be the day" is often associated with optimism and determination, inspiring listeners to believe that great things can happen if they take action and seize the moment.