I think this song uses the Big Bang metaphor to describe the band's unexpected popularity and fame. When they say "We didn't know that it would blow up / With such might" it might mean that the band had no idea that they would eventually become a "big business." They were playing for the love of it and suddenly everyone was showing up to the "late, late, late show / [to] watch us play."
The banging might refer to the music that the band makes--banging on their instruments. And when he says "Some may call me a lucky shot / No, but it was not" I think he is offended that people consider the band's success to be purely luck, since that diminishes the talent of the musicians.
I think this song uses the Big Bang metaphor to describe the band's unexpected popularity and fame. When they say "We didn't know that it would blow up / With such might" it might mean that the band had no idea that they would eventually become a "big business." They were playing for the love of it and suddenly everyone was showing up to the "late, late, late show / [to] watch us play."
The banging might refer to the music that the band makes--banging on their instruments. And when he says "Some may call me a lucky shot / No, but it was not" I think he is offended that people consider the band's success to be purely luck, since that diminishes the talent of the musicians.