I am a first-time author, who is trying to co-author a memoir/biography for a famous Nashville musician. The musician trusts me and wants me to do this book with him/for him. I am a journalist by trade, so writing is no big deal. I have sent out mass queries with some reception. But one agent demanded I include sample chapters with my proposal (which the agent admitted is thorough and well-done). My frustration comes that I think it's a waste of my time and the musician's time to start this book process (interviewing, etc.) to get sample chapters for something that might not ever get published. Not to mention, I have to travel to Nashville to interview him, so I want a deal in place to make it financially feasible. Anyway, am I being reasonable or delusional? It was my understanding that sample chapters are not necessary for non-fiction pieces and only necessary for fiction work.