Thank you for your very kind words!
I have, in fact, debated that very question. It's a tough line to walk: I want the prompts to be specific enough to get your mind searching (without being overly prescriptive) and broad enough that they're open to endless interpretation (but not so broad they're basically useless). I think I erred on the side of the former, which is fine for a single session but obviously gets constraining over time.
Before I settled on the suits/song blocks format, I wanted to use cards to sort of build a "formula" of songs reacting to the previous songs on the list, but couldn't quite get my head around it. Still thinking about it.
Either which way, I'll see what I can do - more supplemental material is on the way!