"But I'm just having fun playing and giving Botox injections to the older songs"

This quote by Richard Marx is a humorous way of expressing his imaginative procedure. He is saying that he is having a good time playing and giving new life to older songs. By using the metaphor of Botox injections, he is suggesting that he is taking older tunes and providing a modern-day twist. This could imply that he is adding brand-new elements to the tunes, such as various instruments or production strategies, to make them sound more modern. It could likewise suggest that he is taking the lyrics and altering them to make them more relevant to today's audience. In either case, Richard Marx is recommending that he is taking older tunes and making them sound fresh and brand-new.