It was only then I learned that the song had been lost in the notebook and that he'd forgotten it long ago. So I was able to play it for him downstairs in the dressing room before the gig and write him out a copy of his own lyric.
It was only then that I found out the song had been lost in the notebook, and he'd long since forgotten about it. Therefore, I could play it for him in the dressing room before the gig and write down his own lyrics.